If your heart rate increases when you smoke weed, maybe you should not do it. Smoking
up does give you a buzz for a while but if you do realise, for long term this has a bad impact on your brain. Try looking for some deaddction program nearby to your place if you fall in the addiction zone. You will be out of it if you will make genuine efforts. Ask your friends and family members to keep a check on you and look for motivation amongst them. Avoid company of people who smoke. You will go through withdrawl symptoms initially but try not to fall weak due to that. Take care and Good luck.