Additional Study Information: This is a four-session study in which we will be recruiting existing cigarette smokers to explore the competitive dynamics between memory encoding and memory retrieval. To participate, you will first go through a phone screening to determine eligibility and learn about the study. Then you will be asked to visit our facility at the Morningside Campus of Columbia University, where you will complete short questionnaires and take part in a computer-based task. Participants will complete two sessions four hours apart from each other, and return one week later to complete another two sessions four hours apart from each other. (Two of the sessions will take approximately 1.5 hours and the other two will be approximately 30 minutes in duration.) In one session participants will smoke a cigarette, in another, they will abstain from smoking. You will be compensated $15/hour for participation.