Thanks for the feedback everyone. There were a few things that helped me get through the most difficult period, the first 6 months. I told everyone I was quitting. I started checking my own blood pressure regularly (with a device from Amazon) as it was high even with meds, and quitting should bring it down, and it has now normalized. I also got a lot of motivation from family and my daughter. I tried not to spend time with other smokers, especially if drinking is involved, losing at least one friend in the process I am afraid. And I bought a good espresso machine! This has given me a different ritual first thing in the morning and I hear that drinking coffee is not bad for you! I don't have any significant cravings now, perhaps once a year I'll want to smoke, usually in a social situation after a night out, but don't. 4 years is a good start!