Circulatory System
THC moves from your lungs into your bloodstream and throughout your body. Within minutes, your heart rate may increase by 20 to 50 beats per minute according to researchers. That rapid heartbeat can continue for up to three hours. For people with heart disease, this faster heartbeat could raise the risk of heart attack.
One of the telltale signs of recent marijuana use is bloodshot eyes. They look red because marijuana causes blood vessels in the eyes to expand or dilate. Marijuana may help stop the growth of blood vessels that feed cancerous tumors.
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