Oh shit, methadone is a lot stronger than plain codeine.
Unfortunately, this college dropout, never learned anything about neuroscience and also unfortunately the person who explained it to me; who had a degree in chemistry before going to med school and becoming a surgeon is dead.
He had pain issues and knew about this stuff, but like I said he is dead.
Hopefully someone here can better explain: yeah there are several on here who seem very knowledgeable and educated on the issue.
All I know is the dumbed down reason I was given about opiods and certain aspects about them.
Methadone is a great pain killer, but it is highly addictive, very strong, hard to get off; of and doesn't pack a buzz.
I have managed to rack up 5 points and a two day no point timeout. I joined less than 6 months before racking up all my bans, so I am trying to be good and not give you any bad ideas.
Then again; I've seen your posts, you don't any help on that.

No offense bro. All I can say is that different opiods have different properties, like that methadone you are on. That is a schedule 2, same as cocaine( it actually has a very, very, limited medical use, and getting medical coke, is impossible.) Besides it is in a liquid form and only used in certain delicate surgeries, where blood vessels need to be constricted.)
If you were able to get as much methadone as you wanted, you would die before you got high, am I right?
The exact reason I am not sure, but I don't think the codeine could keep the methadone withdrawals away. Let alone provide any recreational use.
Codeine in hugh quantities might kill you. Having a high( no pun intended) tolerance will only make it worse. Codeine has it's limits, like all opiods. You will probably overdose and possibly die. Also codeine is hard on the body and can cause a lot of damage if abused.