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Second-Hand Smoke Causes Lung Cancer Secondhand smoke is the second biggest risk factor for developing lung cancer

Environmentalists note that this significantly adds to our pollution problem since most cigarette filters are made of cellulose acetate, a type of non-biodegradable plastic

18 NPR article

Propylene glycol is widely regarded as safe for human use when consumed in moderate amounts .Propylene glycol has very low acute oral toxicity, meaning it takes a large amount to produce noticeable health effects in humans.Toxicity from propylene glycol typically occurs only at plasma concentrations above 4 g/L , which requires an exceptionally high intake within a short period