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nicotine the addictive drug found in tobacco leaves Smokeless Tobacco tobacco that is sniffed through the nose, held in the mouth, or chewed Chewing Tobacco a tobacco product made from chopped tobacco leaves that is placed between the cheek and the gums Snuff finely powdered tobacco for sniffing up the nose Stimulants drugs (such as caffeine, nicotine, and the more powerful amphetamines, cocaine, and Ecstasy) that excite neural activity and speed up body functions. (Myers Psychology 8e p. 300) Tar a thick, sticky, dark fluid produced when tobacco burns Carcinogen a substance that causes cancer Carbon Monoxide colorless, odorless, and poisonous gas Chronic Obstructive Pulmonary Disease a nonreversible lung disease that is a combination of emphysema and chronic bronchitis Chronic Bronchitis a condition where the airways have become inflamed and thickened, and there is an increase in the number and size of mucus-producing cells Emphysema an abnormal condition of the lungs marked by decreased respiratory function Leukoplakia Thickened, white, leathery-looking spots on the inside of the mouth that can develop into oral cancer 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 Secondhand Smoke air that has been contaminated by tobacco smoke 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 alveoli tiny sacs of lung tissue specialized for the movement of gases between air and blood asthma a chronic allergic disorder characterized by episodes of severe breathing difficulty, coughing, and wheezing