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"According to the NAS (Natiional Academy of Sciences), the effects of marijuana on blood pressure are complex, depending on dose, administration, and posture. Marijuana often produces a temporary, moderate increase in blood pressure immediately after ingestion; however, heavy chronic doses may slightly depress blood pressure instead. One common reaction is to cause decreased blood pressure while standing and increased blood pressure while lying down, causing people to faint if they stand up too quickly. There is no evidence that pot use causes persisting hypertension or heart disease; some users even claim that it helps them control hypertension by reducing stress. One thing THC does do is to increase pulse rates for about an hour. This is not generally harmful, since exercise does the same thing, but it may cause problems to people with pre-existing Heart disease. Chronic users may develop a tolerance to this and other cardiovascular reactions."

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10y ago

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