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. 2019 Aug 10;22(5):791–797. doi: 10.1093/ntr/ntz130

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© The Author(s) 2019. Published by Oxford University Press on behalf of the Society for Research on Nicotine and Tobacco. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.

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Figure 3. — The impact of e-liquid sampling and propylene glycol (PG)/vegetable glycerin (VG) ratio on cigarette smoking behavior. Average cigarettes smoked per day in each of the PG/VG ratio e-liquid groups during baseline naturalistic week (Days 1–8) and electronic nicotine delivery system (ENDS) sampling (Days 9–15). For participants who had more than 8 days included in baseline or 7 days included in the sampling week, additional days are not shown. Participants received the ENDS during their sampling visit on Day 9.