Meth and opioid abuse causes permanent brain changes that affect their capacity to feel pleasure. Teenagers are stupid and their brains primed for novelty seeking. Because of this, legalization would drastically increase the volume of drugs available, and thus would most likely increase the number of young people exposed to these drugs, affecting them for life.

I really don't understand the recent push for legalization of all drugs. Meth is not like marijuana and absolutely should not be legalized.