Something is causing the correlation. What do you propose it is?
Would seem to me it is one of three things most likely...
1. Pot has an effect on people that causes the problems
2. People predisposed to making VERY bad decisions (losers) are also the most likely to smoke pot
3. The culture around the use of pot causes the problems
When the correlation is as blatantly strong as regular pot use is to life outcomes, it cannot be ignored.
But I want everyone who wants to use it, to be able to and I make no individual judgments about a specific person for using. I know plenty of people smarter and more successful, in both career and family, than I am that use regularly. I don't make a moral judgment based on use of it is what I am trying to say.