Association of occasional smoking with total mortality in the population-based Tromsø study, 2001–2015
Maja-Lisa Løchen, Inger Torhild Gram, Jan Mannsverk, Ellisiv B Mathiesen, Inger Njølstad, Henrik Schirmer, Tom Wilsgaard, Bjarne K Jacobsen
BMJ Open Dec 2017, 7 (12) e019107; DOI: 10.1136/bmjopen-2017-019107