why are cigarettes harmful Health effects of smoking tobacco What's in a cigarette?

Body Mass Index (BMI) and Metabolic Rate: Factors unrelated to the drug itself, such as BMI and metabolic rate, can influence how your body processes and metabolizes THC

1,3-Butadiene (C 4 H 6 ): This substance can irritate the eyes and cause blurred vision

Though US sales of e-cigarettes are expected to reach $1bn this year, with many brands available, vaping is new enough that there haven't been many studies done yet certainly none of the large-scale, randomised trials that would be necessary to offer conclusive answers about the safety of e-cigarettes, Glantz says

People are surprised to learn that while nicotine may clear in days, the patterns tied to it can last weeks or months if they are not addressed directly