Over 16 million voting-age American adults will use marijuana monthly, according to the latest National Survey on Drug Use & Health for 2011, released today by the Substance Abuse & Mental Health Service Administration. In 2010, the survey estimated 15.6 million Americans aged 18 and older had used marijuana in the past month, a figure that has increased by 498,000 to now 16.1 million regular cannabis consumers. This represents 6.77% of all American adults who are considered criminals every month under state and federal law, or one out of every fifteen citizens aged 18 and older.