Received: 23 April 2021
Accepted: 1 June 2021
First Online: 24 June 2021
: All the Global Adult Tobacco Surveys were approved by ethical boards of surveys countries and CDC, Atlanta. The data used for this manuscript are available in the public domain are de-identified. Therefore, a separate ethical approval was not required for this manuscript preparation.
: Not applicable.
: The corresponding and first author chandrashekhar T Sreeramareddy is an editorial board member of BMC public health.Saint Nway Aye has no competing interests to declare.