how long has tobacco been used Did People Smoke Anything Before Was Discovered? Certainly!. 1. History of Cigarettes

YC/T 2962009 Continuous flow method for determination of nitrate in tobacco and tobacco products (China Standards, 2009)

ORCID: Other Affiliation: Institute for Behavioral Genetics, University of Colorado Boulder, Boulder, CO, USA Sun, Xiao Other Affiliation: Department of Epidemiology, Tulane University, New Orleans, LA, USA Syed, Moin Other Affiliation: Department of Psychology, University of Minnesota, Minneapolis, MN, USA Tal-Singer, Ruth ORCID: Other Affiliation: COPD Foundation, Washington, DC, USA Taylor, Amy E

Reporting summary Further information on research design is available in the Nature Portfolio Reporting Summary linked to this article

Strasser's team is also focused on examining how viewing patterns change over time when smokers are repeatedly exposed to PWLs and how accumulated exposure may be associated with more profound improvements on tobacco use and exposure