The only NFL player to openly advocate for medical marijuana has donated $80,000 to fund cannabis research on football players at the University of Pennsylvania and Johns Hopkins University.

Eugene Monroe, offensive tackle for the Baltimore Ravens, has previously urged the NFL to remove marijuana from its banned substances list so players can use it to treat chronic pain.

"As a player I'm not allowed to use cannabis, but I've been prescribed opioids for various injuries," Monroe said in an interview Thursday evening.

"The opioids work, but they're very dangerous and highly addictive." Monroe, a New Jersey native, said he has watched as teammates and friends battled with addiction to opioid painkillers.

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Sam Wood ~ Philly.com ~