Britton, who turns 29 next month, said he estimates “over 50 percent and it could be as high as 75 percent” of NFL players smoke weed. The NFL tests for it, but less frequently than for performance-enhancing drugs. Britton was suspended by the NFL in 2015 and has not played in the league since.

Attitudes about marijuana are changing in the league, with a number of former players urging that its medicinal use be allowed as a safer alternative to painkillers. In May, Eugene Monroe, who was cut by the Baltimore Ravens in June, pledged $80,000 to further the study of marijuana use in professional football players in an effort to reduce reliance on addictive opioids and anti-inflammatory drugs to reduce the pains of playing in the league.

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“There’s enough anecdotal evidence already to say, ‘Hey listen, we know it’s not toxic. We know it’s safer than what we’re already doing,’ ” he told The Post’s Adam Kilgore.

Twenty-four states plus the District of Columbia have legalized medical marijuana, with more likely by the end of the year. Four states and D.C. have fully legalized. In contrast, overdoses related to prescription pain medication caused 19,000 deaths in 2014.

For Britton, the drug offered more than therapeutic uses.