Smoking can not be easily abandoned, it must be abandoned. The first thing that needs to be done is to fight with one's own mind, that is to say that I have to leave it anyway and know its harmful aspects and always Discuss with others.
Actually it would be easier if you would do it together with someone else, they could be a reason why you quit. Perhaps your girlfriend, he doesn't want to smell a bad breath, your boss, he doesn't want an employee who are smoker, or your family, your children, you don't want to leave them at early age?
See? it is easier that way than just quitting because you want it, probably it is possible if you are into strength training and smoking could weaken you.