Marijuana is the most commonly used illegal drug in the United States; more than 2 million Americans either abuse or are dependent on the drug. The development of a medication to reduce marijuana use and prevent drug relapse by lessening withdrawal symptoms has been a primary focus of research. However, there has been little emphasis on evaluating the efficacy of a treatment that specifically reduces marijuana cravings. This study will evaluate the subjective and physiological responses to marijuana-related cues versus non marijuana-related cues in order to better understand the effects of marijuana cravings.