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"The fact that a black market can sell illicit substances to a small minority cannot possibly be the justification to make abuse of the substance a legitimate mainstream habit." The dean of the Saw Swee Hock School Of Public Health at the National University of Singapore, Teo Yik Ying, has argued that Singapore did the right thing as "an outright ban has contained the problem"

Since then, the Centers for Disease Control and Prevention (CDC) discovered that most patients with lung injuries associated with vaping had consumed products that contained THC, the ingredient that causes the marijuana high, sold not by major e-cigarette manufacturers but by black market sellers

Leonard Maltin's 2011 Movie Guide