The active ingredient in marijuana, THC, can have an effect on anesthesia.When THC enters the body, it attaches to receptors in the brain and central nervous system. This alters the normal functioning of these systems and can result in changes in perception, mood, consciousness, and appetite. Research has shown that THC can decrease blood pressure, heart rate, and respiratory rate. It may also increase anxiety and impair coordination. All of these effects could potentially interfere with surgery or other medical procedures that require anesthesia.
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