Using Novel Behavioral Economic Measures to Characterize Dual Marijuana and Tobacco Use in Young Adults

Inclusion Criteria:

1. Males/females who are 18 to 25 years of age
2. Young adults who currently smoke commercial tobacco cigarettes (≥1x weekly in the past 30 days and for the past six months)
3. Young adults who currently smoke marijuana (≥4 times in past 30 days and at least weekly on average for the last six months)
4. Participants must report purchasing their own tobacco and marijuana at least once in the past 6 months
5. Participants must speak, comprehend, and read English.

Exclusion Criteria:

1. Intention to quit marijuana or tobacco use in the next 30 days
2. Self-reported illicit drug or heavy episodic alcohol use on \>20 days in the past month (excluding marijuana)
3. Individuals who are pregnant or breastfeeding
4. Positive saliva test for recent THC use
5. Breath alcohol level above 0 at any session.
6. Participants who exclusively roll their own tobacco cigarettes