Dropout from substance abuse treatment in general and cocaine dependence treatment in particular is a serious problem, resulting in reduced treatment efficacy, increased likelihood of relapse, ...

While most cigarette smokers endorse the desire to quit, it is estimated that only 14–49% will achieve full abstinence after 6 months (Holmes et al, 2004; Hughes et al, 1999; Hurt et al, 1997; Jorenby ...