" Like other drugs, marijuana acts on a specific part of the brain and, depending on whether you are a person who gets paranoid from a few tokes, it can, like, seriously, help you to mellow out. However, chronic marijuana users show long-term cognitive decline to the tune of 8 IQ points,10 so, in the end, they may be less stressed about reality anyway. "

― Robert H. Lustig , The Hacking of the American Mind: The Science Behind the Corporate Takeover of Our Bodies and Brains