I'm glad you've enjoyed good health and have made it to 86. I was the baby, and am the last one left. I'll be 79 next month. Everybody in my family smoked but me. Both parents and a sister died of lung cancer. My oldest sister died of a stroke at age 74. Father passed at 72, and mother and other sister passed at 69. I feel like I'm living on borrowed time.
When I responded with my initial comment, I should have taken into account, the advances that have occurred in medicine, and especially with heart issues since my brother passed at 51 in 1995. It's obvious that more people can survive a heart attack, and live longer with the proper treatment. My youngest son, age 55 has already been through Stage 3 colon cancer in 2019, and survived. He is now dealing with the diagnosis of Hypertrophic Cardiomyopathy.
I don't know if you saw it, but I posted a link to an article about the actor John Ritter who passed from aortic dissection in 2003. His family said he was misdiagnosed with a heart attack initially when he got to the hospital.
I hope you are on some type of routine to walk briskly for 25 min Daily. That reduces chance of clogging up arteries and keeps heart muscle in better shape. My irregular heart beats went away when I began playing golf 4-5 times a week.