Fig. 3From: Potential for non-combustible nicotine products to reduce socioeconomic inequalities in smoking: a systematic review and synthesis of best available evidencePotential equity impacts of e-cigarette use among adults. Current and ever use are presented together and then separately to provide a sense of difference in product use by the two different measures of education and income. a Current and ever use; b Current use only; c Ever use onlyBack to article page