It's probably 12 Step based and I think it's up to the individual addict to say what they are as long as it's not complete and total fabrication.
I for one, for myself only, if anyone else has a drug problem it's on them what they believe, don't subscribe to the once an addict always an addict philosophy. I smoke pot I drink occasionally and I don't think these things are a problem for me. Will I ever try heroin or coke again? Probably not and more towards definitely not as far as heroin goes.
This is my long winded way of saying whatever works for the individual addict is fine and shouldn't be looked down upon.