Effects Among Smokers Who Use and Do Not Use E-Cigarettes

Exclusion Criteria

• •Primary use of other tobacco products or equal use of cigarettes and other tobacco products
• •Electronic cigarette use on \> 4 of the past 30 days
• •Currently in a smoking cessation program or another clinical trial
• •Use of nicotine replacement therapy or medication which aids smoking cessation in the past 30 days
• •Hospitalization for a psychiatric issue in the past 30 days
• •Heart-related event in the past 30 days. Examples include heart attack, stroke, severe angina (i.e. chest pain), ischemic heart disease, and vascular disease
• •Uncontrolled blood pressure at baseline
• •Planning to move out of San Diego or Kansas City in the next 6 weeks
• •Another person in the household enrolled in the study
• •Women: pregnant, breastfeeding, or planning to become pregnant in the next six months
• •Unstable mental status or health status