It probably depends on the place, it just seems very normal where I live. Young people smoke weed, just the way it is. Even cops have stopped really caring when it's done at open-air events.
But even when you consider that perhaps "only" 50% of your peers have ever tried weed ... what does it say about an employer (or anyone) who readily dismisses half of the population like that?
I live in Scotland currently and went to university. I haven't done weed and neither have, as far as I know, around 50% of my friends.