Parents often struggle with the question of is pot addictive and is it harmful. The answer is yes it is addictive. The diagnostic and statistical manual actually list it specifically as an addictive substance. And, in fact, if you look in the United States, it is third after alcohol and tobacco. It is the third most commonly addictive substance. Is it harmful? Yes it is. The evidence on its harm is as strong as the evidence is for cigarettes. It's not particularly related to cancer like cigarettes are, but it is related to a variety of other issues. If you're at risk for schizophrenia, it dramatically increases the likelihood that you have schizophrenia onset. If you have a history of depression or other kinds of anxiety or other types of disorders, it tends to make them worse. If you're, even if you don't have those things, kids who use pot weekly versus don't use pot are anywhere from 2 to 29 times more likely to get in fights in school, to be expelled, to be arrested, to go to an emergency room, to spend time in jail. They're more likely to be in car accidents. There's a whole variety of things associated with particularly frequent marijuana use that are negative. That doesn't mean that's also true of alcohol and tobacco. This isn't really a question of should it be legal or not. Those are legal substances that are also addictive, but pot is unequivocally addictive, and the abuse of it is unequivocally related to harm.