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.
Today's marijuana is as much as 10 times stronger than the marijuana used in early 1970's. Marijuana affects brain cells. Cannabinoids remain in the fat cells of the bodies of marijuana users. Since one-third of the brain is fat, cannabinoids are stored in the brain. Marijuana can hinder learning by impairing thinking, reading comprehension and verbal and math skills. It can impair or reduce short-term memory, alter sense of time, and reduce concentration.