https://www.erowid.org/references/refs_view.php?ID=9288&S=Nicotine&SField=All
Erowid.org: Erowid Reference 9288 : Metal Concentrations in e-Cigarette Liquid and Aerosol Samples:...
The Index page for the reference article: Olmedo P, Goessler W, Tanda S, Grau-Perez M, Jarmul S, Aherrera A, Chen R, Hilpert M, Cohen JE, Navas-Acien A, Rule...
e cigarette liquid