Not necessarily absolutely but proportionately, since there's no obvious reason for a person who admits to having used in the past year to not admit to using in the past month.
And since 43% of Americans did admit to having used pot in their lives, are you saying the real number is even bigger?
Probably. It’s like the administration saying we have 12 million illegal immigrants here when there are really 3 - 4 times that number when you ask ICE or CBP (real case scenario; they provided me with more accurate statistics)