Earlier quoted context omitted.
Your anecdote and needlessly aggressive comment do make a very compelling argument. But in all seriousness: can you explain why you feel so strongly about this? EDIT: the person I responded to edited their comment to make it 'milder'.
I hate seeing utter lies like this in any debate. It's propaganda and I react strongly to it. Claiming 50% of teenagers smoking weed , let alone lsd, will have problems is an utter, out-right lie. I was never into drugs like friends, if that's what you're insinuating. I tried a few, but beer was my drug of choice, and nicotine for a while. There are polls where something like 40-50% of UK teenagers (and probably US)…
There's plenty of evidence that pot smoking can at the very least exacerbate problems, which strikes me as blindingly obvious when it comes to any substance that has mood altering effects as strong as weed, and I have just as much anecdata to support that view.
That said, I guess I can understand the frustration. I don't know where you live and what the status of weed is, but as a Dutch person I do realize that I don't (often) have to deal with the 'weed is evil' argument, and consequently it's easier for me to not get too upset about it.