Perry Parks, 67, grinds up marijuana to smoke at his home in Rockingham, N.C., Wednesday, Feb. 17, 2010. The retired Army pilot suffers crippling pain from degenerative disc disease and arthritis before turning to marijuana, which he first had tried in college, and was amazed how well it worked for the pain. (AP Photo/Chuck Burton)
Read the article: JOINTS FOR SORE JOINTS: Marijuana use by seniors goes up as boomers age
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