Inclusion and exclusion criteria
Studies with the following criteria were included:1) Only randomized
controlled trials (RCTs) evaluating the effect of different drugs on
smoking cessation were included. 2) Population: alcohol-drinking
smokers, each trial had reports on consumption of alcohol and smoking.
3) Intervention: the experimental group accepted pharmacotherapies and
the control group received a placebo; 3) Outcomes: only the indicators
related to smoking were included, smoking cessation rate signified the
number of people who quit smoking (such as continuous abstinence and
point prevalence abstinence), recorded at the end of each treatment.
Studies that were duplicate reports or with insufficient data, such as
protocols, conference proceedings, or abstracts, were excluded. Studies
written in languages other than English were not included.