Tobacco's Spread Across the World (3:07)
Scientific Studies of Nicotine Use (4:48)
Substances Which Facilitate Addictive Properties of Nicotine (5:27)
History of Cigarettes (3:13)
Connections Between Nicotine and Alzheimer's Disease (7:09)
Alcohol: A Legal but Addictive Drug (3:25)
Alcohol Withdrawal and Dependence (5:44)
Effects of Alcohol on the Brain (5:03)
Risks for Alcohol Dependence: Genetics and Environment (6:18)
Genetic Predisposition for Addiction (4:14)