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Chapter 20

Environmental tobacco smoke- secondhand smoke- air that has been contaminated by tobacco smoke, 2 types mainstream and sidestream

mainstream smoke- smoke exhaled from the lungs of a smoker, sidestream smoke - smoke tha comes from burning tobacco 

nicotine - additive drug found in tobacco leaves

stimulant - substance that increases central nervous system, raises blood pressure, increases heart rate

tar - thick sticky dark fluid produced by burning tobacco