(Fox News) John Richard Knock realizes he’ll likely die in a 12-by-10-foot cell in federal prison.

Locked behind bars on a marijuana trafficking conviction, America’s growing acceptance of the drug is cold comfort to the 66-year-old who was handed two life sentences, plus 20 years — for a first-time conviction.

“I don’t think about it, I just try and stay healthy,” Knock told FoxNews.com of his sentence via phone from the Allenwood Federal Correctional Complex in Pennsylvania. “I just wish society would look at this and say, ‘Hey is this fair?’”

The sentence makes Knock one of 3,278 prisoners recently identified by the American Civil Liberties Union who are serving life without parole for nonviolent drug and property crimes. Nearly four in every five were convicted of crimes involving drugs, including marijuana.

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