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3. Use of Emerging Tobacco Products in the United States
4. Water-Pipe (Narghile) Smoking: An Emerging Health Risk Behavior
5. USDA Economic Research Service, Tobacco Briefing Room, Tables 3 and 5, April 2007. http://www.ers.usda.gov/media/292837/aer789a_1_.pdf. Accessed: 8 January 2016.