Clinical researchers have found it useful to have subjects bring in all their vaping devices (many subjects use more than 1 device) or submit photos of their vapes, to have the most accurate record of device types, nicotine concentrations, and flavors
The best toothpaste for smokers is designed to tackle specific issues such as tooth discoloration, bad breath, and gum health
Marketing a product in a broader scope is of course an entirely different ballgame from selling home-made cigarettes at college campuses or music festivals
Some mediators that have been shown to be increased in the plasma of e-cigarette users include IL-1, IL-6, IL-8, IL-13, IFN-, sCD40L, Eotaxin, RANTES, MCP-1, PDGF-AA, EGF, TGF, HGF, PlGF, bNGF, SCF and VEGF (129, 134)