can marijuana lower your heart rate
Marijuana use raises the heart rate by as much as 100 percent – most acutely after smoking, but this effect may last for a few hours. A prior study showed a 480 percent increase in the risk of heart attack within the first hour following marijuana use, primarily in those at risk for heart attack.
Slow a Very High Heart Rate. 1  1. Practice deep breathing. Although it may seem difficult, lowering your breathing speed will help to lower your heart rate. 2  2. Perform the valsalva maneuver. This triggers the vagal nerve which is responsible for controlling your heart rate. 3  3. Do the carotid (ka-rah-ted) maneuver.