Drug users use a lot of drugs

Is he like 300 lbs?

In general it seems to make no distinction with addicts using high doses to overcome tolerance levels with recreational drug users in general.

Methamphetamines and amphetamines are not the same chemical, despite being similar.

https://methoide.fcm.arizona.edu/infocenter/index.cfm?stid=1...

The small differences between the molecules allow it to penetrate the blood brain barrier more efficiently, has longer lasting toxic effects and acts more as a central nervous system stimulant and

>less peripheral nervous system and cardiovascular stimulation activity. Another difference between amphetamine and MA is that amphetamine stimulates the CNS indirectly by activating the release of catecholamines and inhibiting their breakdown and storage. In contrast, MA stimulates the postsynaptic catecholamine receptors directly.[2]

Increased dosage is only one part of the difference between Methamphetamine and Amphetamines. Street meth is also far more likely to have fillers, leftover solvents and a bunch of other things that are not good for you.

>In general, recreational drug users take their drugs at doses so much higher than psychiatric patients that they're basically two different chemicals

Recreational drug users come in a wide range. The first two sections of the article speak about addicts doing extremely large doses, then seems to lump 'recreational drug users' altogether with that.

“Meth mouth” is caused by the fact that it dries your mouth out, you grind your teeth a LOT, and is often observed in people that have used drugs long/hard enough to find themselves no longer taking care of their health in general, let alone oral hygiene. This often is coupled with financial ruin and utter alienation from society. Somehow, mysteriously, all of the rich house wives and Silicon Valley coders that use it develop meth mouth at a lower rate.