Two heart attacks, two stents. the first in 2006 the second in 2009. Smoked until Jan. of this year, My cardio. Was such a .... that he quit me because I wouldn't quit smoking. Now I know I should have quit, but had other issues that smoking helped me deal with, better than becoming and alcoholic or drug addict. My family Dr. is kind enough to monitor my cardio meds. He also wanted me to quit, and when I told him about vaping and how much I had cut down back in January right after we got out units for Christmas, he was very happy. We saw him again in March, I took my SVD with me and showed it to him, explained a little more in depth how it worked, what was in the E juice and how much nicotine I was using at that time we were on 9 to 12 mg. We now are mostly on 6. His opinion was that the nic. alone was a whole lot better than all the other chemicals we were getting in analogs. He even tried my SVD, I had peach cobbler in it at the time, he was amazed at how good it tasted. He's all for me vaping even with the heart condition. I also am an epileptic and have a chronic pain issue that I take meds for. As well as being a little overweight. Needless to say I'm not the normal guy next door. Vaping has been perfect for me. I have lost over 30 lbs, my BP is lower, my LDL went down, it wasn't real high, but always a concern when you have a cardiac condition. Stick with it, go to your dr. explore your options for lower nic levels and PG/VG ratios.
Good luck, and I think you'll do better when you feel safe enough to toss the analogs.