Yeah, and that's the thing -- from what little I know about Ativan, it can also cause hallucinations, is highly addictive (unlike pot), and can impair your focus. So I see Shaymus's point about why is Ativan ok and pot not. Except for the standardization -- that's my only anti-pot argument.

Editing...
Actually, I just thought of another one. This is an interesting topic. I'm against any kind of self-medication for people who suffer from depression or anxiety. I would never want my fiance (who has both) to self-medicate on alcohol, marijuana, or to take his meds without regular check-ins with his psychiatrist. If he were to self-medicate with pot, and it wasn't being monitored by his pdoc, then I would think it's a bad idea.

Okay, I'm off my soapbox now

Edited...
Sorry. No I'm not. Although I am a recreational pot-smoker and my fiance rarely partakes, I'm now thinking about other people I know. Let's say you're someone who can't hold a job, or whose job sujects you to drug tests. Pot would jeopardize your career, which would be stupid. Or who has trouble getting motivated. Or generally doesn't have your life together. In these cases, pot is a VERY bad idea but monitored doses of Ativan might be a good idea. So, hypocritical though it sounds coming from me, I think maybe I *don't* advocate pot-smoking in most cases. If you have your act together and you're not smoking out of boredom or reality-escape, then that's fine but if not...

Edited again, the last time, I promise:
Then again, if pot were legal then the drug testing thing wouldn't be a concern. I have known some people who have job-applying or job-keeping anxiety, and they smoke their way out of dealing with it. I also wouldn't advocate pot-smoking for anyone under 18.