Figure 1.
(A) Average CPD, (B) average SPD, and (C) exhaled CO by tobacco use group. CO = carbon monoxide; CPD = cigarettes per day; CS = complete substitution; GM = geometric mean; SPD = snus per day; PS = partial substitution; UB = usual brand.
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.