| A | B |
|---|
| addictive drug | a substance that causes physiological or psychological dependence |
| nicotine | the addictive drug found in tobacco leaves |
| stimulant | a drug that increases the action of the central nervous system, the heart, and other organs |
| carcinogen | a cancer-causing substance |
| tar | a thick, sticky, dark fluid produced when tobacco burns |
| carbon monoxide | a colorless, odorless, and poisonous gas |
| smokeless tobacco | tobacco that is sniffed through the nose, held in the mouth, or chewed |
| leukoplakia | thickened, white, leathery-looking spots on the inside of the mouth that can develop into oral cancer |
| nicotine withdrawal | the process that occurs in the body when nicotine, an addictive drug, is no longer used |
| nicotine substitute | a product that delivers small amounts of nicotine into the user's system while he or she is trying to give up the tobacco habit |
| environmental tobacco smoke (ETS) | air that has been contaminated by tobacco smoke |
| mainstream smoke | the smoke exhaled from the lungs of a smoker |
| sidestream smoke | the smoke from the burning end of a cigarette, pipe, or cigar |
