3.9. Analysis.
Comparison 3: Heated tobacco product (HTP) use compared with snus use, Outcome 9: 4‐(Methylnitrosamino)‐1‐(3‐pyridyl)‐1‐butanol (NNAL)
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.