My friend had his weed confiscated and he's really drawn out at the moment (read: batshit, scared, nightmares, hearing things, etc.). Talking to him further, it seems like he was using pot as a psychological crutch, and it's really gotten to him =/
I do worry for him, but at this point in time I've simply talked to him and taken his mind off things a bit, and there's not much else I can do as one friend alone.
This is the sort of reason why I'd hesitate to recommend dependency-forming drugs, no matter how medicinal - for all the people who do use them 'responsibly', there's always someone who ends up going on a downward spiral from it (read: even pseudoephedrine, benign, perfectly legal cough and cold medicine). There's a reason we have Schedules for drugs. There's a reason some things are just so dangerous we're legally bound to have them locked up in safes if they're supplied in the store at all.
People who generalise and say something like marijuana is perfectly safe are kidding themselves. I know friends (and friends of friends lol) who aren't predisposed to handling them well, and that inherent risk alone makes them dangerous as a self-administering medication. If there's a risk of habit-forming with a drug, then it's already a dangerous substance and needs to be controlled.