remove THC from the addict trait

[brojob]

Addict should have a small chance of being addicted to absolutely any chem.
including mundane shit like water or cheese.
including poisons too.
maybe not disease reagents.

if the addict trait functioned like this instead, then i wouldn't have an issue with THC being addictive but i don't think i'd want to spawn addicted to cyanide. im for being addicted to any harmless (or less harmful than a poison) reagents