China Agricultural University, China National Tobacco Corp Zhengzhou Tobacco Research Institute, Zhengzhou University, affiliation not provided to SSRN, China National Tobacco Corp Zhengzhou Tobacco Research Institute, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, China National Tobacco Corp Zhengzhou Tobacco Research Institute, China National Tobacco Corp Zhengzhou Tobacco Research Institute and affiliation not provided to SSRN