Competing interests
Johnson & Johnson), Johnson & Johnson.
DK, HTB, SC, KM declare no conflicts of interest. LS has received honoraria for talks, an unrestricted research grant and travel expenses to attend meetings and workshops from Pfizer and has acted as paid reviewer for grant awarding bodies and as a paid consultant for health care companies. JB has received unrestricted research funding to study smoking cessation from manufacturers of smoking cessation medications (Pfizer and Johnson & Johnson). LD has acted as a paid consultant for the pharmaceutical industry (Johnson & Johnson). MLG received a research grant from Pfizer and served as a member of scientific advisory board to Johnson & Johnson.