Study: NCT03163056

Intervention type: BEHAVIORAL
Group type: ACTIVE_COMPARATOR
Intervention: Cognitive-behavioral treatment (CBT)
Description: The CBT was implemented in group-based sessions of four patients. Sessions were carried out once a week over a 8-week period, with quite date occurring at fifth session. The main component was nicotine fading. From the first to the fourth week, patients were asked to gradually reduce their nicotine intake based on a weekly reduction of 30%. A maximum number of cigarettes per day and also specific cigarette brands with lower nicotine levels were recommended. Other components of the CBT program included information about tobacco, a behavioral contract, self monitoring and graphical representation of cigarette smoking, stimulus control, strategies for controlling nicotine withdrawal symptoms, physiological feedback, training in alternative behaviors, and relapse prevention strategies.

Intervention type: BEHAVIORAL
Group type: ACTIVE_COMPARATOR
Intervention: Cognitive-behavioral treatment (CBT)
Description: The CBT was implemented in group-based sessions of four patients. Sessions were carried out once a week over a 8-week period, with quite date occurring at fifth session. The main component was nicotine fading. From the first to the fourth week, patients were asked to gradually reduce their nicotine intake based on a weekly reduction of 30%. A maximum number of cigarettes per day and also specific cigarette brands with lower nicotine levels were recommended. Other components of the CBT program included information about tobacco, a behavioral contract, self monitoring and graphical representation of cigarette smoking, stimulus control, strategies for controlling nicotine withdrawal symptoms, physiological feedback, training in alternative behaviors, and relapse prevention strategies.

Intervention type: BEHAVIORAL
Group type: OTHER
Intervention: Cognitive-behavioral treatment (CBT)
Description: The CBT was implemented in group-based sessions of four patients. Sessions were carried out once a week over a 8-week period, with quite date occurring at fifth session. The main component was nicotine fading. From the first to the fourth week, patients were asked to gradually reduce their nicotine intake based on a weekly reduction of 30%. A maximum number of cigarettes per day and also specific cigarette brands with lower nicotine levels were recommended. Other components of the CBT program included information about tobacco, a behavioral contract, self monitoring and graphical representation of cigarette smoking, stimulus control, strategies for controlling nicotine withdrawal symptoms, physiological feedback, training in alternative behaviors, and relapse prevention strategies.

Intervention type: BEHAVIORAL
Group type: ACTIVE_COMPARATOR
Intervention: CBT+Behavioral Activation (BA)
Description: This intervention was provided as in the above CBT condition, that is, eight group-based sessions of four patients. Nevertheless, this treatment included a BA component for addressing both smoking cessation and depression management. The BA module included: treatment rationale, information on the relationship between smoking and depression, identification of life areas, values and activities, generation of meaningful and reinforcing activities, social support (i.e., behavioral contracts).

Intervention type: BEHAVIORAL
Group type: ACTIVE_COMPARATOR
Intervention: CBT+Behavioral Activation (BA)
Description: This intervention was provided as in the above CBT condition, that is, eight group-based sessions of four patients. Nevertheless, this treatment included a BA component for addressing both smoking cessation and depression management. The BA module included: treatment rationale, information on the relationship between smoking and depression, identification of life areas, values and activities, generation of meaningful and reinforcing activities, social support (i.e., behavioral contracts).

Intervention type: BEHAVIORAL
Group type: ACTIVE_COMPARATOR
Intervention: CBT+BA+ Contingency Management (CM)
Description: This intervention was provided in the same manner as the above mentioned treatment protocols but with the addition of a contingency management procedure reinforcing abstinence since fifth session and onwards. The number of sessions was the same as in the aforementioned treatment conditions and CO and cotinine samples were also collected. Participants providing negative specimens of both CO (≤4 ppm) and cotinine (≤80 ng/ml) earned points exchangeable for rewards (e.g., cinema tickets) on a schedule of escalating magnitude of reinforcement (from 10€ voucher value with maximum possible earnings of 175€ in vouchers).