%0 Journal Article %A Rachel Kornfield %A Jidong Huang %A Lisa Vera %A Sherry L Emery %T Rapidly increasing promotional expenditures for e-cigarettes %D 2015 %R 10.1136/tobaccocontrol-2014-051580 %J Tobacco Control %P 110-111 %V 24 %N 2 %U https://tobaccocontrol.bmj.com/content/tobaccocontrol/24/2/110.full.pdf