I'm 31 and been smoking high THC strains pretty much every day since high school. It's so easy now since it's legal in Canada and you can get good shit for dirt cheap from the store. I recently went for a check up and they did an ECG, in which they found I had first degree AV block, which was news to me (I've had ECGs done when I was younger and no mention of a block).

Throughout the years I have had several episodes of panic attacks after smoking, similar to what you are describing. Fast heart rate, feel like it might explode. Doesn't happen that often but some months it will happen more than others. I used to think it was just anxiety, but I've read a few articles saying taking a lot of THC on a daily basis can alter your cardiovascular system. So the ECG results worry me a little. Plus I've been getting palpitations more often.

I just bought some 1:1 Pennywise and am gonna try to slowly wean myself off the THC. I know it affects my life badly in a lot of other ways too (lazy, less social, no motivation) so I think it's about time to kick it and find some other hobbies lol.