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.
The mean within-session percentage changes in erectile tumescence across time for successful and unsuccessful quitters. Error bars represent standard errors of the means. The means have been adjusted for pack years, total cigarette consumption throughout enrolment, baseline erectile functioning, and smoking status at mid-treatment.
