Classification: Stimulant
Active Compound: Nicotine
Found in: Tobacco, nicotine chewing gum, nicotine skin patches, chewing tobacco, snuff, cigarettes, cigars, pipe tobacco
Mode of Consumption: Inhalation (smoking), insufflation, ingestion (chewing), transdermal (patches), intrabuccal
DEA Scheduling/Legal Status (in US):Unscheduled, legal over age 18
Effects: Calmness, mild euphoria, increased concentration, increased heart rate, hypertension, increased metabolism, increased respiration, anorexia, altered blood flow
Acute: Dizziness, weakness, nausea, more rarely tremors, convulsions, fatal overdose (extremely rare)
Chronic: Addiction, tolerance, withdrawal, depression, increased risk of heart disease, stroke, stomach cancer, pancreatic cancer, cervical cancer, renal cancer, bladder cancer, blood cancer
Inhalation (smoking): increased risk of lung cancer, lung disease; Insufflation: nasal septum damage, increased risk of oropharyngeal cancer; Intrabuccal: increased risk of oropharyngeal and esophageal cancer
Dangerous Drug Combinations:
Potentially fatal mix with cocaine. Dangerous combination with other stimulants.
Special Considerations:
Nicotine is often claimed to be the most addictive substance available.


And remember, if somebody needs help, play it safe and call for medical assistance.

“Students may bring an intoxicated or drug-impaired friend to University Health Services or to a hospital, or seek assistance from College residential life staff or HUPD, and by doing this, neither they nor the friend will face disciplinary action from the College for having used or provided alcohol or drugs.”

                                                                                    The Amnesty Policy
Harvard College Student Handbook

Buzzed: The Straight Facts About the Most Used and Abused Drugs from Alcohol to Ecstasy (Third Edition), by Cynthia Kuhn, Scott Swartzwelder, andWilkie Wilson. Published 2008 by W. W. Norton & Company.
National Institute on Drug Abuse (NIDA), part of the National Institute of Health (NIH) of the U.S. Department of Health and Human Services. 
U.S. Drug Enforcement Agency (DEA), part of the U.S.Department of Justice.
Erowid Organization