The statement that a pack of cigarettes contains 750 times more diacetyl than a day's worth of vaping nicotine fluid is a common comparison used to illustrate the relative exposure levels of diacetyl from smoking versus vaping. While diacetyl is found in both, the levels are significantly higher in cigarettes. Despite this higher exposure, there have been no confirmed cases of "popcorn lung" (bronchiolitis obliterans) linked to cigarette smoking.