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Introduction
A 32-year-old microwave popcorn factory worker in Missouri went to the doctor complaining of shortness of breath and a dry cough that wouldn’t quit. Pulmonary function tests showed severe, fixed airflow obstruction. A lung biopsy confirmed bronchiolitis obliterans — irreversible scarring of the small airways. He’d never smoked. The culprit was diacetyl, the butter-flavoring chemical he’d been breathing in for three years on the production line.
That’s popcorn lung. The medical term is bronchiolitis obliterans, and it’s exactly what it sounds like — your bronchioles (the tiniest airways in your lungs) get damaged, inflamed, and then scarred shut. Once that happens, the damage is permanent. You don’t get those airways back.
Florida has food manufacturing plants, coffee roasting facilities, and vape shops across South Florida. Workers in these environments face real exposure risks. People who vape heavily — especially sweet, buttery flavors — may be inhaling the same chemicals that caused those factory outbreaks. When someone develops a serious, permanent lung disease from a workplace exposure or a defective product, Florida law provides specific remedies with tight deadlines.
What Happens to Your Lungs
Bronchiolitis obliterans is an obstructive lung disease, but it doesn’t work like asthma or COPD. When you inhale certain toxic chemicals — diacetyl is the most notorious — they damage the lining of your bronchioles. Your body tries to heal the damage, but the healing process goes wrong. Instead of restoring normal tissue, your lungs lay down scar tissue that narrows or completely blocks those tiny airways.
You end up with progressive shortness of breath, a chronic dry cough, wheezing, and fatigue that gets worse over time. Inhalers don’t help much because the obstruction is structural, not muscular. Pulmonary function tests show a fixed reduction in airflow — your FEV1 drops and stays low even after bronchodilators. High-resolution CT scans reveal mosaic patterns and air trapping. In unclear cases, a lung biopsy shows the characteristic concentric scarring around the bronchioles.
There’s no cure. Treatment focuses on stopping further exposure, managing symptoms with oxygen or inhalers, and pulmonary rehabilitation. Some patients stabilize after they’re removed from the toxic environment. Others deteriorate over months or years. Severe cases may end up on transplant lists.
Where the Exposure Happens
The first cluster of popcorn lung cases showed up in workers at microwave popcorn plants in the early 2000s. NIOSH and OSHA investigated and found very high airborne levels of diacetyl in the mixing and packaging areas. The workers who got sick had been breathing in vaporized butter flavoring for years with no respiratory protection and inadequate ventilation.
Diacetyl is safe to eat. It’s in actual butter, and it’s added to thousands of food products. But when it’s heated and aerosolized — when you’re breathing it in at high concentrations day after day — it destroys lung tissue.
The same risk exists in other settings. Coffee roasting facilities have reported cases because diacetyl is released during roasting. Flavoring manufacturing plants that blend or heat diacetyl-containing compounds present obvious hazards. Bakeries and snack food production lines that use butter flavorings can create exposures if ventilation is poor. Florida has plenty of food production and coffee roasting operations from Miami-Dade up through Broward and Palm Beach counties.
Most of these cases fall under workers’ compensation because the exposure happened on the job. But third-party liability can come into play if a flavoring manufacturer sold a defective or inadequately labeled product, or if a contractor designed a ventilation system that failed to protect workers.
Vaping and Diacetyl
The same chemical that caused the popcorn factory outbreaks ended up in e-cigarette liquids. Independent lab testing in the mid-2010s found diacetyl and a related compound, acetyl propionyl, in a large percentage of flavored vape juices — especially creamy, custard, and buttery flavors. Some samples had diacetyl concentrations comparable to occupational exposures.
The toxicology is straightforward. If inhaling diacetyl at work causes bronchiolitis obliterans, inhaling it from a vape pen can do the same thing. The exposure mechanism is identical. What’s less clear is how many vapers have actually developed biopsy-confirmed popcorn lung, because most people with vaping-related lung injuries don’t get biopsies. They get diagnosed with “vaping-associated lung injury” or generic interstitial lung disease and never get the specific bronchiolitis obliterans diagnosis.
That doesn’t mean the risk isn’t real. It means the cases are hard to track and harder to prove in court. A 19-year-old who’s been vaping vanilla custard liquid for three years and develops progressive shortness of breath might have popcorn lung, but without a biopsy and detailed exposure records, connecting the disease to a specific product is an uphill fight.
Florida product liability law allows claims based on design defect and failure to warn. If a vape manufacturer put diacetyl in its liquid, knew or should have known that inhaling diacetyl causes irreversible lung disease, and failed to warn consumers, that’s a textbook failure-to-warn claim. If a safer alternative formulation was available and the manufacturer chose the dangerous one anyway, that’s a design defect.
But these cases require serious medical proof. You need pulmonary function tests showing fixed obstruction. You need a high-resolution CT. Ideally, you need a biopsy. You need an expert pulmonologist who can testify that the pattern of injury is consistent with diacetyl exposure and inconsistent with other causes. And you need records — purchase history, product labels, chemical testing of the specific e-liquid the person used.
Florida Workers’ Compensation and Occupational Lung Disease
If you develop bronchiolitis obliterans from breathing in diacetyl or other toxic chemicals at work, your claim falls under Chapter 440, Florida Statutes. Workers’ compensation in Florida is a no-fault system. You don’t have to prove your employer was negligent. You just have to show that the injury or disease arose out of and in the course of your employment, and that work was the major contributing cause.
Occupational lung diseases fit the statute’s definition of a compensable injury, but they’re also among the hardest types of claims to prove. The disease has to be “due to causes and conditions characteristic of and peculiar to” your particular job. Bronchiolitis obliterans caused by diacetyl exposure in a flavoring plant meets that test. Bronchiolitis obliterans in someone who worked in an office and vaped on breaks does not.
The other problem is timing. Florida’s workers’ compensation statute of limitations requires you to file your claim within two years of the date of injury. For a traumatic injury like a broken leg, that’s straightforward. For a latent disease that develops slowly over months or years, the clock starts when you knew or should have known that your lung disease was work-related. If you’ve been coughing for a year and your doctor finally diagnoses bronchiolitis obliterans and asks about your work history, that’s when the two-year window opens. Wait too long and the claim is barred.
Workers’ compensation covers medical treatment and a portion of lost wages. It does not cover pain and suffering. It does not cover full wage replacement. For someone in their 30s with permanent, progressive lung damage who can’t work in their field anymore, workers’ comp benefits are a fraction of the actual loss.
That’s where third-party claims come in. If the diacetyl exposure came from a flavoring product manufactured by a company that isn’t your employer, you can sue that manufacturer for product liability in civil court while also collecting workers’ comp. If a contractor designed a defective ventilation system and your employer hired that contractor, the contractor isn’t protected by workers’ comp immunity. Those third-party cases allow recovery for pain and suffering, full lost earning capacity, and punitive damages if the conduct was reckless.
Product Liability Claims Against Vape Manufacturers
Someone who develops popcorn lung from vaping isn’t an employee of the vape company, so workers’ comp doesn’t apply. The claim is a straight product liability case under Florida tort law.
Florida follows a modified comparative negligence rule. If you’re more than 50% at fault for your own injury, you recover nothing. If you’re 30% at fault, your recovery is reduced by 30%. Defense lawyers in vaping cases often argue assumption of risk — the plaintiff knew vaping carried health risks and chose to do it anyway. That argument works better for generic “vaping is bad for you” warnings. It works less well when the specific risk is permanent lung scarring from a flavoring chemical the manufacturer never disclosed on the label.
The statute of limitations for negligence and product liability claims in Florida is currently two years. It used to be four, but the legislature cut it to two for claims accruing after March 2023. That’s an aggressive deadline. If you’re experiencing symptoms and suspect they’re related to a product you used, waiting a year to “see if it gets better” can kill your claim.
Florida also has a statute of repose in product liability cases, which bars claims after a certain number of years from the product’s first sale, regardless of when you discovered the injury. The exact limitations depend on the type of claim and product, but the takeaway is the same — delay is dangerous.
Proving a vaping-related popcorn lung case requires a mountain of evidence. You need the actual e-liquid bottles or at least records of what you bought. You need chemical testing showing diacetyl in those specific products. You need medical records documenting your diagnosis with pulmonary function tests, imaging, and ideally a biopsy. You need an industrial hygienist or toxicologist to testify about exposure levels. You need a pulmonologist to explain causation. You need a vocational expert to quantify lost earning capacity if you’re young and permanently disabled.
These cases are expensive to litigate and they take years. But for someone with a confirmed diagnosis, documented exposure, and a defendant with resources, the damages can be substantial — lifetime medical costs, decades of lost income, and compensation for a permanent reduction in quality of life.
What to Do If You’re Experiencing Symptoms
Shortness of breath that gets worse over weeks or months is not normal, especially in someone under 50 who doesn’t smoke. A dry cough that doesn’t respond to cough suppressants or inhalers is not normal. Wheezing and chest tightness that your doctor keeps calling asthma, but the asthma medications don’t help — also not normal.
If you work in food manufacturing, coffee roasting, flavoring production, or any job where you’re around aerosolized chemicals, and you’re developing respiratory symptoms, tell your doctor your work history in detail. “I work in a popcorn plant” or “I work in a coffee roasting facility” should trigger specific questions about ventilation, respiratory protection, and chemical exposures.
If you’ve been vaping heavily for a year or more, especially sweet or buttery flavors, and you’re developing progressive breathing problems, tell your pulmonologist exactly what you’ve been vaping. Bring the bottles if you still have them. Most doctors don’t ask detailed questions about vaping because they’re focused on smoking history. You have to volunteer the information.
Pulmonary function testing is the starting point. If your FEV1 is significantly reduced and doesn’t improve with bronchodilators, that’s a red flag. High-resolution CT imaging can show the characteristic patterns of small airway disease. In some cases, a lung biopsy is the only way to definitively confirm bronchiolitis obliterans, but not every patient is a good candidate for biopsy.
The most important thing is to stop the exposure immediately. If the disease is caught early and you’re removed from the toxic environment, further damage may be preventable even though existing damage is permanent. If you keep breathing in diacetyl or other lung toxins, the scarring will progress.
From a legal perspective, document everything. Keep records of where you worked, what products you used, what chemicals you were exposed to, and when your symptoms started. Take photos of product labels. Request copies of Safety Data Sheets from your employer. Save purchase receipts for vape products. Get copies of every medical record, test result, and imaging study.
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The Two-Year Clock
Florida’s workers’ compensation statute of limitations is two years from the date you knew or should have known your lung disease was work-related. The personal injury statute of limitations for product liability and negligence is two years from the date the cause of action accrued. In latent injury cases, accrual is usually when you discover the injury and its cause, but courts have held that you “should have known” earlier if a reasonable person in your position would have connected the dots.
Say you’re diagnosed with bronchiolitis obliterans in January 2024. Your pulmonologist asks about occupational exposures and vaping history. You mention you worked in a flavoring plant for five years and vaped daily for three years. At that moment, you’re on notice that your lung disease might be connected to those exposures. The two-year clock starts ticking. If you wait until February 2026 to call a lawyer, you’re likely outside the limitations period for a claim that accrued in early 2024.
The statute of repose issue is separate. Even if you didn’t discover your injury until recently, if the product was first sold more than a certain number of years ago, the claim may be time-barred under the repose statute regardless of discovery. These rules are unforgiving.
If you have a confirmed or suspected case of popcorn lung and a history of occupational exposure or heavy vaping, talk to a lawyer who handles toxic tort and occupational disease cases as soon as you have a diagnosis. Waiting to see if you qualify for disability or waiting until your condition stabilizes can blow your statute of limitations. The insurance companies and manufacturers know exactly how these deadlines work, and they’re counting on people waiting too long.
