why do meth/heroinc/etc addicts often have the same face shape?

Question

When I say “face shape” I mean they often have squarish/jutting jawlines and somewhat sunken cheeks. I see it in those that are very heavy users of opiates or amphetamines.

Is it the method of administering that causes it (IV vs. smoking etc) or something else?

In: Biology

Answer 1

Jaw clenching is common with amphetamine users and can make the jaw look more pronounced. Also weight loss