Why the UK government shouldn't tax e-cigarettes?

Recently, a British researcher published an article pointing out that in view of the lower risk advantages of e-cigarettes compared with ordinary tobacco products, he suggested that the government should not tax e-cigarettes and similar smoking devices. The researcher pointed out that if the government wants to tax e-cigarettes and similar smoking devices, the tax rate should also be lower than that of traditional tobacco products, which can improve public health. But the EU's newly revised Tobacco Products Directive stipulates that e-cigarette products should be taxed. In this regard, a British economist believes that this is not conducive to the development of new products.