| Carcinogens | A substance thought to promote or facilitate the growth of cancerous cells.
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| Drug | Any biologically active substance that is foreign to the body and is deliberately introduced to affect its functioning.
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| Mainstream smoke | Smoke that is exhaled after being filtered by the smoker's lungs.
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| Physical Dependence | A drug induced condition in which a person requires frequent administration of a drug in order to avoid withdrawal.
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| Secondhand smoke | A combination of mainstream and sidestream smoke.
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| Sidestream smoke | Smoke which comes directly off the burning end of the cigarette/cigar/pipe.
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| Withdrawal | A temporary illness precipitated by the lack of a drug in the body of an addicted person.
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