I have hung out with a few meth heads. I used to do it a lot with them recreationally. For some reason the physical addiction thing never got me. I hated doing it. I just did it because my girlfriend at the time wanted to and all she ever wanted to do was have sex. So we did, a lot. After a while it wore out, and I was not into doing meth with her so we stopped seeing each other. She stopped doing it shortly afterward too, she actually listened to my complaints about it. She has been on the road to getting her life together ever since. She still seems to be something of a mess in her personal life, but not in terms of the really self-destructive behaviors when we were dating.
A friend of mine in HS was a meth addict, he shot it. By the time he was 18 you could already see the ravages of Meth.
It’s disgusting. I am pro-legalization on a lot of things ,including stuff most people would never agree to even if they were for marijuana legalization, but Meth, that should be illegal.