The cognitive behavioural approach group : This group will receive an inclusion visit at first, then two "cigaret exposures cessions" during hospitalisation. Thereafter-one week after he's out- the patient will come for 5 follow up visits consisting in the specific technique of cigaret exposure and nicotinic treatment adjustment. Then the last visit, at six months, will tell us if the patient is an effective non smoker or not; We'll be also collecting psychological and medical informations (such as the treatment, IMC, cardiovascular check up and psychological tests). The control group : This group is managed as "usual" : the nurse gives very rapid recommendations to the patients concerning smoking cessation. Nicotinic substitutes are proposed to the patients but the patient must find them by itself.