Yes, it certainly would be wonderful!  Trouble is, in general it can't be done, and here's why:

When a person sets out to make major changes in his or her life, and becoming a non-smoker is about as major a change as most people ever have to deal with, that person needs to commit fully to making the change a success.  Attitudes like "I'll try", or "I hope this works" won 't cut it.  They need to decide "This is right for me, now is the time, and I am going to do it!". 

If you, with their best interest at heart, were to present them with a gift session for smoking cessation, and it wasn't their own idea, the chances of success would be poor.  For hypnosis to help anyone make lasting major changes in his or her life, that person must be committed to the change, and that commitment begins with them spending their own hard-earned money for it.  And if you will forgive a personal note, these sessions last about two hours and are rather intense, not only for the client but also for the hypnotist.  It would be disappointing, even discouraging, to invest that much time with people who are "just looking".