Diacetyl Free Vape Juice: Safe Brands Guide (2026) Cyclone Pods Did you know some flavored vapes contain diacetyl, a chemical linked to popcorn lunga rare, irreversible lung disease? It scars the small airways, making it hard to breathe. Symptoms can mimic Which E Juices Have Diacetyl? VanGo Vapes Vape juice contains a long list of chemicals, many of which aren't even listed on the packaging. Testing has also shown that vapes labelled "nicotine free" can have high nicotine levels.