I'm by no means a doctor, but here's my story about heart disease:
My father and all his siblings died of heart failure at various ages dependent upon lifestyle choices beyond smoking (only 2 of 6 smoked). Myself and my siblings: one died of a massive heart attack at the age of 56 (ex-smoker by way of patch cessation who had gained significant weight and became seditary), one recently had a stent placed at the age of 65 (never smoked, never overweight, still very athletic), one that has never smoked and for 10 years works almost excessively at staying fit and healthy, and still has to fight high blood-pressure and cholestrol. Myself . . . I laid the smokes down so that's a start. The next generation?? Well, my son had a 100% blocked thigh artery at the age of 30. He started on the patch the day he was diagnosed with the possiblity of loosing his leg. He immediately gained 20 pounds and has continued to slowly gain over the last 3 years. He'll be on blood thinners for the rest of his life and will always be a very high-risk candidate for heart attack. It scares me senseless . . . even more so as I see him stuggle to no avail to get those quitters-pounds off.
Doctors, more than one, have confirmed for me, genetics are the MAIN factor in heart disease. And they have all agreed, giving up smoking to clear up your oxygen levels is the way to go, but it does no good if you pack fat around your heart and lungs because of it! My doctors have not asked me to quit because of my history. They've asked me to work on lifestyle moderation. This is where I think vaping offers the greatest benefit. It's giving me the chance to really improve my overall health!
Best of luck to you!! And think "moderation".