????? ??????? ??????? ?????????? ????? ?????? (??? ????? ???? ??? ????? ?????? ??????? ?? ???????? ??????? ??? ??? ????? ????????? ?????? ??? ?????? ????? ?????? ?????? ?? ??????? ?????? ?? ??? ???? ?? ?? ??? ???????).It is assumed to work by decreasing craving and withdrawal signs and symptoms, and by lowering reinforcement of the cigarette smokin