4: Number of persons approved by the federal government to smoke medical marijuana (US Drug Enforcement Administration).
16: Medical marijuana states (Americans for Safe Access).
750,000: Estimated number of qualified patients in California (NORML, June).
24.8 million: Estimated number of eligible patients under current state laws (See Change Strategy, March 2011).
$1.7 billion: Estimated size of the annual medical marijuana market in the United States (See Change Strategy).
$8.9 billion: Forecasted size of the annual US medical marijuana market in 2016 (See Change Strategy). Read more after the jump.