carbon monoxide definition tobacco The main harmful components of environmental smoke. CO, Cigarette smoke contains more than

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Nicotine, present in tobacco products, stimulates nicotinic acetylcholine receptors, leading to increased heart rate, enhanced alertness, and temporary stress relief

Although progress has been made to increase the protection of nonsmokers in the United States from exposure to secondhand smoke since the release of the 1986 Surgeon General's report on the health consequences of involuntary exposure to tobacco smoke (USDHHS 1986a), biomonitoring of exposure indicates that about 40% of nonsmokers, and about one-half of young children 311 years of age, continue to be exposed (CDC 2010)