Why does smoking marijuana sometimes cause bloodshot eyes?
by 
Daydreamer
ANSWERS: 4
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Within a few minutes after inhaling marijuana smoke, an individual's heart begins beating more rapidly, the bronchial passages relax and become enlarged, and blood vessels in the eyes expand, making the eyes look red. --From Utah Dept. of Public Safety, State Bureau of Investigation website http://sbi.utah.gov/narcotics/mari_identification.html
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THC(Tetrahydrocannabinol) causes dilation of blood vessels which often leads to "red-eye."
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The tar and smoke sticks and irrirates the eye. Inching can also happen!
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I think it somehow makes blood flow to your eyes. It's not dangerous. People actually smoke it to help with glaucoma. Wear some sunglasses or use some Clear Eyes.
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