if you are healthy and have no known heart conditions increased heart rate isnt a bad thing for you unless we are talking very high heart rate by itself. I get that also but it depends on what type im using and a few other conditions. if you smoke cigs. drink a lot, are out of shape and i dont mean just sorta i mean really out of shape those can all contribute and they are just a few. maybe try a different strain that may help. as much as no one likes to admit it, not everyone can smoke mj. for whatever reason it may be. and it isnt the end of the world