Tobacco is a product prepared from the leaves of the tobacco plant by curing them. Tobacco contains the alkaloid nicotine, which is a stimulant. Dried tobacco leaves are mainly used for smoking in cigarettes, cigars, pipe tobacco, and flavored shisha tobacco. They can be also consumed as snuff, chewing tobacco, dipping tobacco and snus. Tobacco use is a risk factor for many diseases, especially those affecting the heart, liver, and lungs, as well as many cancers.
Tobacco should not be used at all.