TY - JOUR T1 - E-cigs have lower levels of harmful toxins JF - Canadian Medical Association Journal JO - CMAJ SP - E331 LP - E331 DO - 10.1503/cmaj.1095396 VL - 189 IS - 8 AU - Roger Collier Y1 - 2017/02/27 UR - http://www.cmaj.ca/content/189/8/E331.abstract ER -