I've had PVC's off an on for about 10 years. They never occur when I'm running or jogging (or at least I'm not aware of them)
They don't seem to come on any kind of a schedule. Once they came on when I was in the library (no stress at all!) Other times when I'm under stress for whatever reason, my heart beat is completely regular.
I also have Afibs and those come on after I eat a very fatty or spicy meal. But again, not always.
Puzzling!
it's amazing that you can smoke and still run a marathon. What do you think accounts for that? I smoked years ago and can now only run a 10.5 minute mile as my fastest. But I can bike through hilly terrain for hours, since that demands less oxygen.
Some say that fish oil helps with PVCs. And maybe magnesium.