Everyone has seen the 'Faces of Meth' series by now. But it isn't as if methamphetamine is the primary drug that wreaks havoc on the human body and mind.
Rather than preaching total recreational substance abstinence and lumping everything in the same category of 'deadly', kids in school should be made aware that the effects of marijuana use versus the physical and mental decay involved with hard drug addiction are separate entities, and that the latter is nothing to fuck with.
I'm not trying to exploit anybody's issues or chastise indulgence in other drugs, but to exhibit the cruelty of chemical deterioration on the human body.
Faces of Smack
Before:

After:
Before:

After:

Not so bad until it’s taken into account that he doesn’t have any real teeth left
Before:

After:

(second to left)
They all look like different people
Stay healthy and stay high