Clinical Research Directory

Inclusion Criteria: * Aged 21-29 years * Current e-cigarette (EC) user (defined as ≥ weekly use over the past 3 months) * Willing to provide informed consent and abstain from using their EC at least 12 hours prior to the four lab sessions * Read and speak English Exclusion Criteria: * Recently COVID-19+ (defined as positive test in the past 30 days) or a recent COVID-19 hospitalization (defined as a hospitalization within the past 6 months) * Unstable or significant psychiatric conditions (past and stable conditions will be allowed) * History of cardiac event or distress within the past 3 months * Are currently pregnant, planning to become pregnant, or breastfeeding (will be verified with urine pregnancy test) * Have suffered from any serious lung disease or infection (e.g. , tuberculosis, cystic fibrosis, or lung cancer) in the past 30 days * Have hemophilia or another type of bleeding disorder * Are blind, severely visually impaired, deaf, hard of hearing, or have a severe motor disability