There are increasing concerns about the escalating use of electronic cigarettes (e-cigarettes). In particular. smokers have been advised by important agencies such as the US Food and Drug Administration about the potential harm to the health of these products. being now considered as drug delivery devices. https://atzbota8hcqy.collectblogs.com/79712210/environmental-protection-tax-and-total-factor-productivity-evidence-from-chinese-listed-companies