Overview

E-cigarette (EC) use continues to increase among youth, and EC may be detrimental to youth respiratory health. Public health officials and the Food and Drug Administration (FDA) can now regulate ECs. The proposed study uses naturalistic assessments called ecological momentary assessment (EMA) to understand how ECs use may impact the respiratory health of youth and young adult users compared to never-using peers.

Eligibility

Inclusion Criteria:

1. own a smartphone and willing to add study EMA and spirometry application to it.
2. a current exclusive-EC user (endorse ≥weekly use over the past 3 months) and report never trying OTPs
3. between the ages of 18-25 years old at the time of enrollment
4. read and speak English
5. willing to complete five, 2-week periods of daily EMA and home-based spirometry
6. never-users must indicate never trying any tobacco product to be eligible for enrollment

Exclusion Criteria:

1. self-reported diagnosis of lung disease including cystic fibrosis or chronic obstructive pulmonary disease; we will not exclude youth who have asthma, but will incorporate this as a covariate during analyses
2. unstable or significant psychiatric conditions (past and stable conditions will be allowed)
3. history of cardiac event or distress within the past 3 months
4. are currently pregnant, planning to become pregnant, or breastfeeding