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.
Restricted cubic spline (5 knots) to explore nonlinear association between cannabis smoking and lung cancer risk in all subjects showing the fitted odds of being a case versus being a control under different exposure measurements: (a) Joint-equivalents per day; (b) Duration; (c) Joint-years. Gray area, 95% confidence interval. Each model was adjusted for age, sex, race, highest education, tobacco smoking status and packyears, and study.
