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.
Scatterplots showing the relationship between log10 THCCOOH normalized to specific gravity (SG, y axis) vs. normalized to creatinine (x axis) for frequent and occasional smokers by routes oral (Active-O), smoked (Active-S), vaporized (Active-V), oral 5 and placebo.
