4.8% of Americans have used pot in the past year but not the past month: http://www.samhsa.gov/data/NSDUH/2012SummNatFindDetTables/DetTabs/NSDUH-DetTabsSect1peTabs1to46-2012.htm#Tab1.1B.
Do you really expect those numbers to be accurate? It ‘s like walking into a church and asking, “So how many of you here are gay? Raise your hands”.
So I don’t take much stock in reports like that. Most are paid for by government funding with agendas to push