Medically? Or recreationally?
[EDIT]: BTW, in your poll, "Have you TRIED it" doesnt mean they are for or against legalizing it. I've done a few status offences just once or twice, but don't necessarily want the age requirement to go down. Or make them legal -Recreationally-
I really don't think it would be a good idea for pot to be legal and able to be sold in stores... it causes enough trouble as it is for parents. Now, if people were RESPONSIBLE and just did it under moderation with a sober person around and proper health concerns, that would be a different story, but highly unlikely. Yes, people will get it anyway, but then it is not as easy as "Hey 'brother', can you buy me some pot?"
On the other hand... if they legalized it recreationally, which I highly doubt will ever happen, they could control it much better. Also, they would be able to add 'fees' and 'pot tax' on it which would probably make it cost a lot more than it does now for the average person to get it. May be more annoying to have it legal than illegal for the people who do use it.
Medically, I think should be fine in certain situations. The penalty and social hate for it (can't think of the word right now...) I fell are way too high. There are plenty other things to be worried about, and should focus on those things as opposed to just stopping a few kids in their homes having fun.