Acknowledgements
This study was partly supported by the National Natural Science Foundation of China (31670148 and 31870147), the Fundamental Research Funds for the Central Universities (XDJK2016A009 and XDJK2017C015), the Science and Technology Projects of Chongqing Company of China Tobacco Corporation (NY20180401070010, NY20180401070001, and NY20180401070008), and the Innovation Fund for Social Programs and People’s Livelihood Guarantee of Chongqing (cstc2016shmszx0368). We would like to thank Mr. Zhang Hongjiang for his help in processing the mechanism diagram.