Figure 1.
Schematic representation of Vype ePen (e‐cigarette) compared to the 3R4F reference cigarette [Adapted from Taylor et al. [2016]].
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.