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. 2020 Feb 19;7(1):e000452. doi: 10.1136/bmjresp-2019-000452

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© Author(s) (or their employer(s)) 2020. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Urinary metallothionein (pg/mg of creatinine), 8-OHdG (ng/mg of creatinine) and 8-isoprostane (pg/mg of creatinine) are significantly elevated in electronic cigarette users compared with non-smokers. (A) Metallothionein levels among the different smoking groups. (B) 8-OHdG concentration in the different smoking groups. (C) 8-OHdG concentration in the younger and older populations. (D) 8-isoprostane levels among the different smoking groups. (E) 8-Isoprostane levels in the younger and older populations. (F) 8-Isoprostane levels in men and women. Bars are the means and SD for each group. *P<0.05; **p<0.01.