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.
How Marijuana Works on the Brain. People who smoke marijuana begin to feel its effects almost immediately, while those who eat it may not feel it for up to an hour. When you smoke pot, THC goes from your lungs to the bloodstream and causes your brain cells to release the chemical dopamine, leaving you feeling high.