Author Michael Pollan explores our history and relationship with this 'invisible addiction'
                                
                                
                                    (Newser) -
                                    When author Michael Pollan decided to tackle the subject of psychoactive drugs—specifically, opium, mescaline, and caffeine—for his new book,  This Is Your Mind On Plants , he consumed the first two in the name of experimental journalism. But he actually stopped using caffeine, just to see what would happen,...