No, I'm sorry, I have to disagree: those ads are stupid. That irritating little dog being all like, "You disappoint me." Those ads make me want to get stoned and punt a puppy across a large room. And I love puppies! I don't think they really make the case for "smoke pot = loserdom." I think they make the case for "guy with talking puppy = tool." I really doubt that anyone sees those and says, "Yeah, pot is lame!"
The anti-pot ads I liked were the ones with the kid talking about how when he smokes weed he just goes and sits on his friend's couch in his basement. And that's it. They don't do anything and life just passes them by. I thought that was honest and probably the closest thing to a convincing argument one was likely to see in a PSA. Although really: does anyone think, "Ooh, marijuana looks so glamorous!" I bet it's more like, "Ooh, marijuana makes my boring suburban life a little funny and helps pass the time." But then, I've never been much for what is (for me) essentially an expensive sleep aid. So perhaps I'm biased. :)
That dog is a tool.
Also, I hate him. And his little flag.