All I can say is what my experience has been.
My ex-abf never asked me for money, and I never offered it. If he would snort his money away, it was his problem. If he didn't have money for cigarettes, he didn't smoke..there was always food in the house so he ate.
For the first year he gave me money out of every paycheck towards household expenses, then the addiction took hold, money came but less and less. Then nothing, he started to take my jewelry and pawn it, nothing expensive, as I kept that in my safety deposit box, I started to find money missing from my wallet....that did it, tossed him out.
My point is, this is a progressive disease, it will get worse.
He is an adult, he needs to be responsible for himself, by enabling him, you are only making things worse, aiding his addiction and prolonging his need to seek recovery. He must fall to his knees, before he can get back up.
You have food in your house, so he won't starve, the rest is up to him. If you
love him, help him to find recovery by not enabling and running to his rescue.
My Best,
Dolly