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.
All forms of the drug are mind-altering and the drug's psychoactive effects occur within minutes of inhalation, usually lasting anywhere from 2-4 hours. Most experts assert marijuana has no athletic-related performance-enhancing potential and, under its influence, is believed to: 1  Impair hand-eye coordination. 2  Reduce reaction timing and motor coordination. 3  Reduce motor coordination and perceptual accuracy.  Impair 1  concentration. Increase heart rate and fatigue.