Addiction
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Randomized Controlled Trial
Effectiveness of a stepped primary care smoking cessation intervention: cluster randomized clinical trial (ISTAPS study).
To evaluate the effectiveness in primary care of a stepped smoking cessation intervention based on the transtheoretical model of change. ⋯ A stepped smoking cessation intervention based on the transtheoretical model significantly increased smoking abstinence at a 2-year follow-up among smokers visiting primary care centres.