1.
Wu M, BCIT School of Health Sciences, Environmental Health, Heacock H, Tirado M, Shaw F. Presence of nicotine in marketed nicotine-free e-liquids for electronic cigarettes. ephj [Internet]. 2017 May 1 [cited 2022 Oct. 6];. Available from: https://journals.bcit.ca/index.php/ehj/article/view/88