In Dan's case he had lost his sense of taste around that time and his throat was sore and he was doing the choking mucous thing, but all things considered and compared to where we are now - he would felt like a lottery winner if he had been able to stop at 25.

I don't know if age makes a difference though. You may have said and I just forgot, but what is your dad's overall health aside from this? And how long has he been a non-smoker? I don't know much about this, but I think I read it can be harder on smokers???

David you are one strong stubborn guy - I bet your family had their hands full with you during treatment.