title: In the absence of clear evidence: substantiate all aspects of an issue.
authors.affiliation: Rédactrice en chef, RCSP, École de santé publique de l'Université de Montréal. editor@cpha.ca.
authors.forename: Louise
authors.initials: L
authors.lastname: Potvin
mesh_terms: D002170:Canada; D066300:Electronic Nicotine Delivery Systems; D055317:Evidence-Based Practice; D006801:Humans; D007878:Legislation as Topic; D010506:Periodicals as Topic; D011634:Public Health