RT Journal Article SR Electronic T1 Decrease in the proportion of illicit cigarette use in Brazil: What does it really mean? JF Tobacco Control JO Tob Control FD BMJ Publishing Group Ltd SP s287 OP s288 DO 10.1136/tobaccocontrol-2018-054846 VO 29 IS Suppl 4 A1 Andre Salem Szklo A1 Roberto Magno Iglesias YR 2020 UL http://tobaccocontrol.bmj.com/content/29/Suppl_4/s287.abstract AB