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.
Nicotine discrimination (panel A) and overall response rate (panel B) dose-effect functions obtained prior to VCL assessment, as well as prior to and following CYT assessment. Each point is the mean (±SEM) of either 12 (pre VCL) or 10 subjects (pre and post CYT).
