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. 2017 Mar 7;12(1):1289651. doi: 10.1080/19932820.2017.1289651

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© 2017 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 1. — pH titration curve of exclusive waterpipe smokers (EWPS, n = 36) and non-smokers (n = 36). Data are mean (□ for non-smokers and ∆ for EWPS) and standard deviation (). *Student’s t-test p < 0.05: non-smokers vs. EWPS for the same volume of HCl.

Inline graphic — pH titration curve of exclusive waterpipe smokers (EWPS, n = 36) and non-smokers (n = 36). Data are mean (□ for non-smokers and ∆ for EWPS) and standard deviation (). *Student’s t-test p < 0.05: non-smokers vs. EWPS for the same volume of HCl.