I have many times thought I did the wrong thing, but the reason was not to be a medical doctor - it was just to have the information. But then, maybe I was wrong, I don't know. ↗
I don't operate on smokers. I tell cigarette smokers that I can operate on you, I get paid the same. And you might even do well. But it's the wrong thing to do. So I refuse to operate on you until you stop smoking. ↗