Injections in rats, tested over periods of days? What about use in humans, over their lives? For an obvious counter-point paper: Persistent cannabis users show

Injections in rats, tested over periods of days? What about use in humans, over their lives? For an obvious counter-point paper: Persistent cannabis users show neuropsychological decline from childhood to midlife (2012) http://m.pnas.org/content/pnas/109/40/E2657.full.pdf http://m.pnas.org/content/pnas/109/40/E2657.full.pdf (dunno about the team, but the paper was edited by Michael Posner)