Joe is taking his second tour of duty in detox for opiate addiction, and Lindsay Lohan is nowhere in sight.

Endeavor House’s detoxification facility in Kearny isn’t movie-set glamorous. It’s retrofitted into the old West Hudson Hospital. There are no views of oceans or valleys from this city street.

“It’s a real working-class rehab that’s serious about recovery,” Endeavor House executive director Steve Wicke said. “We are aware (that) addiction is a disease of chronic relapse. That’s a fact of the disease.”

Joe, who requested his last name not be used to protect his family, doesn’t want an ocean view. At 23, the former Rider University student who grew up in the heart of Central New Jersey suburbia wants to get off pills and stay off pills. Take two of detoxification, a five- to seven-day medical protocol, impressed on him the stark fact of relapse: It happens. It happens to the vast majority of addicts.

“It was one drink — just one drink,” Joe said, at a holiday party that sent him back to a Rioxicette habit and, in less than a year, saw him living on the streets.

And, ultimately, back in detox, the first step in a treatment process many follow with a stay in a residential treatment facility, immersion in 12-step fellowship programs and a lifetime of dedication to recovery.

Today’s addicts are younger than ever. Some start using at 11 or 12. By 14, they can be veterans of rehab. They get hooked on prescription painkillers such as Rioxicette — a.k.a. Roxies, or “blues,” for their color — and may graduate to cheaper, easily obtained heroin.

Right now, Wicke noted, more than half the people seeking treatment at Endeavor House’s facilities are under age 25. Of those in that category, 80 percent are treated for addiction to opiates. That’s a marked rise from 10 years ago “when the most common addictions were cocaine and alcohol” and the typical addict 35 and older, he added.

“These kids haven’t even started their lives, and they’re full-blown 10- to 15-bag-a-day (heroin) addicts,” said Barbara Cashin, former clinical director and currently director of business development for Endeavor House. “Remember, it’s not picking up a joint. There’s a genetic predisposition and a physiological addiction to the opiate.”