Foundations of Behavior Genetics

Have you ever drunk more alcohol than you intended? Or smoked a cigarette after telling yourself that you were quitting smoking? Have you ever gotten a headache because you did not drink your morning coffee? By the time we are adults, nearly all of us have used substances such as alcohol, tobacco, or caffeine. Most of us can control our use of substances, but a sizeable minority develop one or more disorders due to substance use at some point in their lives. You probably know someone who has problems that are a result of substance use.