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.
It's the absolute worst time, she says, because the mind-altering drug can disrupt development. Lisdahl points to a growing number of studies that show regular marijuana use â once a week or more â actually changes the structure of the teenage brain, specifically in areas dealing with memory and problem solving. That can affect cognition and academic performance, she says.