Clinical Research Directory

Inclusion Criteria: * Female and male, aged 21 to 55 years; * past year daily cigarette use, verified by urine cotinine levels above 100 ng/ml -lifetime history of e-cigarette use; in good health as verified by medical history -screening examination, and screening laboratory tests * women, -using acceptable birth control methods. Exclusion Criteria: * History of major medical or psychiatric disorders that the physician investigator deems as contraindicated for the participant to be in the study * risk factors for EVALI (E-cigarette or Vaping Product Use-Associated Lung Injury) including history of lung diseases (e.g., asthma or COPD), vaping THC or CBD * regular use of psychotropic medication (antidepressants, antipsychotics, or anxiolytics) * current alcohol or substance use disorder for any other recreational or prescription drugs other than nicotine * for women, pregnant as determined by pregnancy screening, or breast feeding * seeking (or undergoing) treatment for tobacco dependence or smoking; reported aversion to e-cigarettes, or tobacco flavored e-liquid.