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Instead, they look for cotinine, the chemical your liver produces as it breaks down nicotine

Small amounts of nicotine, when ingested, can raise peoples blood pressure, give them heart attacks, and even kill them. Glasser notes the only way to gauge the safety of a tobacco-containing product would be to send a sample to a lab for positive confirmation testing, which would accurately gauge the level of nicotine per milliliter in the batchbut theres still an added hurdle, he says

Chemical and biological studies of a new cigarette that primarily heats tobacco.: Part 1

Over the past 20 years, tobacco production has declined more than 13%

Hu, B.-B

Through decades of life changes, including quitting hard drugs and alcohol, cigarettes were a near constant