Effect of Concurrent Hookah and Alcohol Consumption on Smoking Topography and Toxicant Exposure

Inclusion Criteria: 1. Report using hookah at least 1 time per month over the past 6 months 2. Are at least 21 years old 3. Speak and understand English 4. Do not currently suffer from lung disease including asthma, CF, or COPD 5. Do not currently suffer from heart disease 6. Are not currently pregnant or breast-feeding or have plans to become pregnant or begin breast-feeding at any point during the study 7. No current, regular use of \>5 cigarettes or other tobacco products (e.g., e-cig, cigar, etc.) per month. 8. No current marijuana use \> 5 times per month 9. No use of illicit drugs during the past 30 days 10. willing to provide informed consent and abstain from all tobacco, nicotine, and marijuana use for at least 12 hours and abstain from alcohol for at least 24 hours prior to each of the two sessions 11. Live within 25 miles of the study location. 12. Have a friend who is eligible and willing to participate. 13. Consume 2 or more or one or more drinks per episode for men and women, respectively 14. Drink alcohol at least one time per week 15. Not currently be seeking treatment for alcohol use 16. Able to answer at least two hookah-specific screening questions from the screener. \- Exclusion Criteria: 1. Hookah use less than one time per month over the past 6 months 2. Under the age of 21 3. Unwilling to abstain from alcohol for 24 hours and tobacco and nicotine products 12 hours prior to each study visit 4. Live more than 25 miles from the study location 5. Pregnant or breast feeding or plan to become pregnant or begin breast feeding at any point in the study -