I’ve experimented with Marijuana use when riding mostly in my younger years. When I did consume THC I noticed that my heart rate would increase about 10 beats per minute compared to when I didn’t consume THC. This response seems to only happen with THC and not CBD dominant products. I also noticed a similar response (with my resting heart rate) with alcohol.
After discovering this pattern I decided to stop consuming THC in and around exercise time - especially when I was doing more demanding activities that caused my HR to above tempo. My thinking was that THC could be putting undue stress on my heart and may not be a good thing long term.