Healthy volunteers age 21-55 are needed to take part in a research study at Johns Hopkins. We are seeking people who 1) smoke cigarettes or use an e-cigarette daily, 2) have used both at least once in the past month, and 3) have a history of occasionally using cannabis (marijuana). Participants will be paid up to $1,730 for study completion. Study involves smoking cannabis, smoking tobacco cigarettes, and vaping with an e-cigarette over seven experimental sessions.
Click here to see if you are eligible.