from recent article in Medical Marijuana Business Daily:

“According to the number crunchers at Washington State’s Office of Financial Management, a “fully functioning marijuana market” could result in an in-state total of $1.021 billion gross sales of marijuana grams per year. … So, extrapolated, this data could indicate that the total US marijuana marketplace could be as big as $46.42 billion per year if cannabis were legalizednationally.

Read entire article at:  http://mmjbusinessdaily.com/2012/11/27/potential-us-marijuana-market-estimated-at-nearly-50-billion/