Youth Use of e-Cigarette Flavor and Device Combinations and Brands Before vs After FDA Enforcement.

The results of this longitudinal cohort study of youth in the US suggest that most youth who initiated or continued e-cigarette use in 2021 used flavor/device combinations that were excluded from CTP's enforcement priorities. Restrictions and enforcement efforts that only cover a subset of products may be ineffective at preventing youth flavored e-cigarette use.