In some counties that there are good possibilities that happened when they legalized the marijuana but not all the countries in the whole world. Why? Because its community some of them they abuse using marijuana. They using it a drugs and some them are minors.
Marijuana is illegal in my country, how come minors are still able to abuse it? It is a matter of choice of the person himself/herself if they are going to abuse marijuana be it illegal or legal. I think the only thing that changes when it becomes legal is the economy of it. It's actually a lot cheaper while it's illegal because once you've made that legal, people will be selling it everywhere and people will all be buying it. The supply wouldn't last and at some point, stores will be left nothing but high quality weed which is a lot more expensive than the usual ones. Funny how people be thinking that they can abuse drugs once it has become legal. The truth tho, it will be a lot more expensive.
Nonetheless, this will increase the overall collected tax. It's good for the economy of a country. People have another thing to consume and get addicted to just like beers, liquors, and cigarettes. Add a sin tax to that then bam! in a couple of years, the economy is booming. FYI, though, there wouldn't be as much casualties if people do get hooked on weed because it doesn't make you do bad things. It helps you relax.