Not Medical Advice: Tobacco is not a man-made substance. It's an agricultural crop, most commonly used to make cigarettes.
After it is picked, it is dried, ground up, and used in different ways. It can be smoked in a cigarette, pipe, or cigar. It can be chewed (called smokeless tobacco or chewing tobacco) or sniffed through the nose (called snuff).
Tobacco is a nervous system stimulant that triggers complex biochemical and neurotransmitter disruptions. It elevates heart rate and blood pressure, constricts blood vessels, irritates lung tissue, and diminishes your ability to taste and smell.
Are you one of the more than 70% of smokers who want to quit? Check out some tips on how to quit smoking at Cdc.gov.