210
Participants
Start Date
January 31, 2005
Primary Completion Date
September 30, 2009
Study Completion Date
June 30, 2010
tobacco abstinent contingent
Participants receive vouchers wiht monetary rewards for providing breath samples that show tobacco smoking abstinence
non-contingent
Participants receive vouchers regardless of tobacco use status
control
this group receives no vouchers
Johns Hopkins Bayview Medical Center, Center for Addiction and Pregnancy, Baltimore
National Institute on Drug Abuse (NIDA)
NIH
Johns Hopkins University
OTHER