Seventeen methadone-maintained cigarette smokers received 4 weeks of c
ontingency management (CM) as a stop-smoking intervention. Results ind
icated that CM patients significantly reduced breath CO levels from ba
seline to completion of treatment and that 23.4% of patients maintaine
d 1 week or more of continued smoking abstinence. Results indicated a
link between smoking abstinence and reduced cocaine use, although not
reduced opiate use, which raised questions about possible shared biolo
gical and psychological mechanisms for tobacco and cocaine use.