RT Journal Article SR Electronic T1 Contemporary impact of tobacco use on periodontal disease in the USA JF Tobacco Control JO Tob Control FD BMJ Publishing Group Ltd SP 237 OP 238 DO 10.1136/tobaccocontrol-2015-052750 VO 26 IS 2 A1 Emily Vogtmann A1 Barry Graubard A1 Erikka Loftfield A1 Anil Chaturvedi A1 Bruce A Dye A1 Christian C Abnet A1 Neal D Freedman YR 2017 UL http://tobaccocontrol.bmj.com/content/26/2/237.abstract AB