Fig. 2

Transitions in Hookah Use and Co-use of Tobacco, Alternative Tobacco Products and E-Products among SM Adult Current Hookah Smokers, arranged according to Single, Dual and Poly Use, Waves 1 and 2 (2013–2014). E-products include e-cigarettes, and e-hookah and e-pipe (Wave 2 only); smokeless tobacco include snus, moist snuff, dip, spit, chewing tobacco or dissolvable tobacco; and other combustibles include traditional cigars, filtered cigars, cigarillos, pipe tobacco. Single use was defined as those who reported hookah only use; dual use was defined as those who concurrently use hookah plus one other product category; and poly use was defined as those who concurrently used hookah plus 2 or more other product categories