Hand pain can be caused by disease or injury affecting any of the structures in the hand, including the bones, muscles, joints, tendons, blood vessels, or connective tissues. Hand pain is one feature of joint inflammation (arthritis) that may be felt in the hand.
Marijuana and the Eyes. Marijuana has a few key effects on the eyes. One of the most noticeable occurs shortly after smoking the drug: redness of eyes. THC in marijuana lowers blood pressure which dilates the blood vessels and increases blood flow throughout the body.
4. Brain. Short-term marijuana use has no serious impact on the brain. Long-term use, on the other hand, has been linked to impaired thinking, memory problems, and psychological issues including anxiety. The effects of alcohol consumption on the brain are almost too many to mention.