As do I.
I have rarely met a habitual pot user who wasn't an unmotivated leech. That's the kicker. Almost every pot user I've ever met hasn't seemed to care about anything in life except how to get high again. It's sad.
I think this depends on what their motivation in smoking it in the first place is. My brothers used to be stoners and but they worked for their money for their next high. Eventually they realized that working dead-end jobs just to pay for their weed wasn't going to actually get them anywhere and, since they both liked money more than being high, they stopped smoking so much and have been working on bettering themselves.
On the flip side, my Mother actually uses it for pain control. She has rhuematoid arthritis in her hands that is so bad some days that she can't even move her fingers...and she has to work on a computer. The pot helps with the pain and to relax the muscles but she's a responsible type of person to begin with so she almost never actually "stoned". She will smoke enough to be able to function but not so much that she is actually getting high. No doubt she gets a bit of a buzz, hard to avoid, but she's not useless and watching TV and eating Cheetos all day.
I think a lot of it comes down to the type of personality you're dealing with. A responsible person isn't likely to stop being responsible just because they can, legally, have a joint now and then and a addictive personality type will find something
to be addicted, legal or not.
I'd rather see pot legalized and treated like alcohol/cigarettes. Grow it, sell it, tax and regulate it.