Additional Study Information: RESEARCH VOLUNTEERS: Healthy male and female (age 18-60) MARIJUANA SMOKERS who also smoke CIGARETTES needed for a study of nicotine and marijuana. For 2 weeks, you would visit the lab every other day (1-2 hours) and then you would move onto a research unit at the NYS Psychiatric Institute for 9 full days. Compensation for time: $1,147-$2,003. Contact for more information.