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71 Studies on the effectiveness and impact of branding have yet to be completed

The concentrations of nicotine can vary widely, toxicity of the ingredients has not been adequately studied, and other issues make the devices unfit for use, members of the International Respiratory Societies wrote in a July 2014 position paper on e-cigarettes

Both methods provide nearly identical onset speeds, making them effective for immediate craving relief

doi:10.1021/acs.est.6b01741 Hess CA, Olmedo P, Navas-Acien A, Goessler W, Cohen JE, Rule AM

For example, he said, we need to know what impact electronic cigarettes will have on a smoker compared with traditional methods to stop smoking, such as nicotine patches or gum, because those methods have not proved to be very successful