I'm surprised at the number of bikers that smoke, maybe it goes with the 'risk' attitude or possibly the "it won't happen to me" thinking.
For me, the most amazing thing is how smokers can ignore the fact that it really makes you stink. When my colleague returns to the office (even a few desks down), with a fresh spray of perfume and a chewing gum I can still smell her before she sits down. I actively avoid speaking directly to her. I'm not even going to mention the breath on my other mate... good God.. both are blissfully unaware....
Your grandson will not only appreciate you smelling sweetly, he'll also enjoy being with you and getting those sloppy kisses that all grandmothers give:-)
Besides, the poor sod has been through enough. He's proven he's a fighter, a gift and therefore a joy to love. You don't want anything to change that or give him any further problems, (there's evidence that people with COPD (caused by smoking) produces blood "markers" that can adversely affect other parts of the body, heart, brain, kidneys etc. With a (potentially) inefficient heart you surely don't want him even getting a whiff of a carcinogen that could lower his %O2 staturation, however slight.
Good luck Kaz, keep us updated on your progress......
) It's nice to now your doing really well , definately going to be worth it, not just for you but the whole family. I'm doing OK too, cut back 
although i don't feel 
...Do you think i should 