R.J. Reynolds Tobacco Company , Bugwood.org

R.J. Reynolds Tobacco Company , Bugwood.org

Howard F. Schwartz, Colorado State University, Bugwood.org

Howard F. Schwartz, Colorado State University, Bugwood.org

Howard F. Schwartz, Colorado State University, Bugwood.org

Howard F. Schwartz, Colorado State University, Bugwood.org

Howard F. Schwartz, Colorado State University, Bugwood.org

Howard F. Schwartz, Colorado State University, Bugwood.org

Howard F. Schwartz, Colorado State University, Bugwood.org

Howard F. Schwartz, Colorado State University, Bugwood.org

Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org

Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org

Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org

Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org