Make sure he does'nt smoke anymore weed laced with crack...most likely he did not smoke weed with "crack" in it. Sounds more like angel dust (PCP) to me which is the most common adulterant in marijuana and can cause major personality changes, paranoia, psychosis, etc. He also might have just smoked some really killer weed or some sativa that had intense trippy effects or that heart racing buzz some people can't handle.

He needs a break from smoking weed if you ask me, I don't think kids should be smoking weed anyways.

Take him to the nearest mental hospital you can find and set up a visit or a tour so he can see where he is headed if marijuana is causing him to be in some type of unstable state of mind, ask him if he would like to stay there and see his reaction. As far as being obsessed with making money..that is not always a bad thing. It does make the world go round' like it or not. Maybe he is just waking up to that reality now...for all you know he might be just fine, or he might be selling drugs which is why he would have good reason to be paranoid. Either way, if he is just smoking weed then you really don't have much to worry about imo, it's the other dangerous drugs like cocaine, pcp, prescription pills, etc that do the real damage. Good luck, God bless.