Mine changed me over with a flourish (hard to do when typing, but he managed) and a high-five. He was also my father's doctor, and my father died at 68 of...well, everything, but the smoking didn't help.
The last time I went in with what I called a mix of anthrax and the Black Death, he said that although my ears were completely clogged, my lungs sounded fantastic.
My cardiologist was a little more reserved and hesitant, but he's pretty old-school and was reasonably open-minded about the electronic. Since conservative care is what I want in a cardiologist, I was willing to accept that.
One local hospital won't allow nicotine replacement for employment, it's abstinence or nothing. I'm not sure about the others.