People here more often than not tend to say yes and that it is an easy, reliable method. Some even claim it feels good.
No offense to them and no intention to commit a crime or break a rule but if that is true, why have they not attempted that way? Most if not all the people saying those things never attempted with an opioid.
Opioids sounded too good to be true and they are. Very serious brain damage if it fails, common to experience pulmonary edema while conscious even if it succeeds. Pulmonary edema feels like drowning.