Fig. 4

Transitions in Hookah Use and Co-use of E-Products and Alternative Tobacco Products among SM vs. Heterosexual Adult Current Hookah Smokers, Waves 1 and 2 (2013–2014). E-products include e-cigarettes, and e-hookah and e-pipe (Wave 2 only); and alternative tobacco products include cigarettes, smokeless tobacco (i.e., snus, moist snuff, dip, spit, chewing tobacco or dissolvable tobacco) and other combustibles (i.e., traditional cigars, filtered cigars, cigarillos, pipe tobacco)