Nicotine is a highly addictive stimulant found in tobacco. This drug is quickly absorbed into the bloodstream when it is smoked. Nicotine has many physical effects: rapid heartbeat, increased blood pressure, shortness of breath, and a greater likelihood of colds and the flu.
More Info: http://kidshealth.org/teen/drug_alcohol/drugs/know_about_drugs.html#a_Nicotine
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