Normal heart rate for someone who's teenaged or adult is between 60 and 100 beats per minute. A very athletic person has a slower heart rate, generally, between 40 and 60. Smoking weed raises your heart rate and blood pressure, especially right after smoking. Cigarettes do the same thing. That's why weed increases your risk of heart attacks and rhythm problems in that early after-smoking period. It's also irritating to the lungs, which'll also affect your heart rate.