A randomized controlled trial was conducted in cardiology department and smoking cessation center of University Hospital of Monastir (Tunisia). All smokers Hospitalized for ACS were included. Participants were randomly assigned to either group "A", initiating Nicotine replacement therapy (NRT) in intra-hospitalization or a control group "B" that received NRT after hospital discharge. The end point assessment was smoking abstinence at 24 weeks following randomization, defined as self-reported abstinence in the past week before the 24 week clinic visit confirmed by a measured exhaled carbon monoxide ≤8 ppm. Data were analyzed by intention to treat.