Doing drugs in the first place isn't too smart. Luckily there are HR resources like bluelight.
Sure it can be done and yields results, but it's one of the most harmful and low-BA ways to do it.
If he developed his OC habit by smoking it, then maybe that's what his brain has been accustomed to. He may get more oxycodone into his bloodstream using another ROA, but the fact that he needs to replicate those first few times, and do it in his own little world, routine, tickle his fix, that's his way of doing it.
There are an infinite amount of things/environments/routines/act-of's to get addicted to when a opioid drug is involved in the mix.
It's just the complicated fact that oxycodone passes through the reward center and what it does to dopamine/serotonin/etc. chemicals that cause it to be so addictive, encompassing whatever was done to GET the drug, HOW the drug was done, WHERE is was done, WHO was around you, and so on and so on.
The fact that smoking OC yields at least SOME results is what will never stop people from smoking OC. That's just the way it is.
regardless,
this will soon be a null issue with the takeover of the OP 80s
Don't be so quick to jump to conclusions. People find ways around EVERYTHING. Let's just see how this plays out...