article about fentanyl use in Seattle – a highly addictive, completely synthetic opiate, that is more powerful than heroin.
Then, in the summer of 2009, he started hanging around with a girlfriend who liked opiates. He’d heard that fentanyl was back in the city, so he went back to it. “I was kind of doing it recreationally for a while, but your tolerance builds almost immediately, after just a week,” he says. (The half-life of fentanyl is only about two hours, experts say. The half-life of heroin is around six.) “I would start to go into withdrawals on a daily basis.”