It doesn’t take long for these drugs to put their hooks in you. I got sick with cancer 3 years ago and was put a regimen of fentanyl patches and oxycodone which I stayed on for about 5 mons (I recovered thankfully). Never exceeded my prescribed dose. When I quit them I felt like death warmed over for about 4 day, couldn’t sleep for a week and was kind of depressed for a couple months after. Just goes to show that you can quickly get physically dependent on opiates even though you’re not addicted. I really would advise people to try to steer clear of these drugs if possible, although if you’re suffering with acute pain there are really no alternatives to opiates. They do work at killing pain.