Dear Sir/Ma'm, My father has been diagnosed with the written condition for more than 3 years now, he has also smoking for over 20 years, now a days it's limited to 1-2 cigerette per day. I wanted to know, if under given existing medications, I can buy chewing gums and lozenges available for assisting smoking craving for my father? Are there any possible side-effects of them? The goal is to reduce smoking to zero. What should be whole process be like to be perfectly streamlined and some suggestions and advice please? What external gums like nicotex etc. which are advertised could be bought for this and what other options are there, please? Many Many Thanks & Regards!