Tobacco contains the highly addictive stimulant alkaloid nicotine as well as harmala alkaloids. Dried tobacco leaves are mainly used for smoking in cigarettes and cigars, as well as pipes and shishas . They can also be consumed as snuff, chewing tobacco, dipping tobacco and snus.
Tobacco use is a cause or risk factor for many diseases; especially those affecting the heart, liver, and lungs, as well as many cancers.
Tobacco is harmful to human health, but it is really a difficult habit to quit, especially for smokers.
Here below is a cool set of vintage snapshots that shows ladies smoking cigarettes from between the 1930s and 1960s.