Paranoia is one of the most unpleasant "side effects" of marijuana. It's also a key experience shared by marijuana smokers and people with schizophrenia. But exactly how does smoking a joint cause the feeling that dark forces are conspiring to do you wrong? New research in rats may help explain the source of this distress. The study, led by Steven Laviolette at the University of Western Ontario in Canada, involved training rats to fear the scent of either almond or peppermint. The scents were delivered to rats in a cage either with black-and-white striped walls or with black polka dots...
