I was a daily opiate user for the best part of two years. Took pretty much whatever I could get my hands on, including heroin but never injected. I'd drink a lot of poppy tea because it kept me high for 12 hours. So I'd be able to have some before bed and wake up high to take more drugs and then drink some tea before work and be fine until I could get home and get high again
April 2010 I gave that up. Just stopped, cold turkey and have never touched an opiate again to this day. That was easier than dieting.