Wondering if anyone has questioned this before. I smoked daily for years. I was diagnosed 2 years ago with either IST or SVT...for which I take propranolol (and now I am symptom free with the exception of some PVCs around my period)..seemed the exact dx was not important as treatment and f/u is the same (said they are both benign..sees nothing to ablate..wont kill me...common...mild..nothing to worry about...yada yada). I quit smoking at that time. Once in a while I am at a gathering and wonder if taking a puff would hurt me at all. Seems this new heart development as benign as they say, makes me afraid of everything. Anyone have anything to say about this??