[HackerThemAll]

Drinking too much coffee or even water can kill you. Too much sugar can kill you (albeit not too quickly). Obsessive eating or shopping can derail your life pretty quickly. Obsessive use of social media can induce depression. Some people kill themselves because of what they read or see in social media.

So it's not the legalization at fault, it's people who are overdosing any stuff that's available to them. Casual smoking a weed once a week won't harm you that much.