If it was only considered solely about public health, I would agree with banning tobacco (in general), probably putting it together with some soft drugs like Marijuana which can easily cause addiction and proven harm to one's own health and probably others.
I understand that life is not only about health, happiness is not only about staying healthy, choices are important for those who can exercise their own freedom to pursue personal lifestyle even if it comes with some risks. Definitely there are people who can exert control in their habits, hence the personal choice may be still responsible and not harming themselves or others. We should also recognise that there are people who find themselves in deep addiction and experiencing health impact due to the addiction problem, which I would deem addiction as a health problem just like for narcotic drugs.
Legal or non-legal status will impact the modus-operandi and platform for the vested interest ('the industry'). Tobacco industry is one of the well oiled but probably most unethical business lobbyists in the world to help strategize to expand and entrench their market share. If the government would have found out and established the scientific evidence of harms and addiction of tobacco back in the early century, probably they would have outlawed the products too.
Harm reduction in narcotic drugs and tobacco are played out very differently, former can work more effectively given that there is no legal opposition possible to make moves against, the latter is different: they can invest in plenty of outlets such as neoliberal organisations like IDEAS, they can approach and lobby powerful people. Some of the industry's so-called 'harm reduction' ideas such as 'light cigarette' and 'small pack cigarette' are bad and harmful instead; so-called 'contraband' cigarettes are not inferior/ciplak products and most likely 'leaked' by the industry intentionally to counter official high tax products to increase sales in different social tiers. Harm reduction in narcotic drugs I definitely support and think it can work; for tobacco products, it would be a contest with the legal industry, public health sector could be financially outmuscled though I hope they could do much better to prevent or rehabilitate people from addiction.
I am agnostic about the ban on vapes, surely I can see the public health benefits to do so, but I understand that there are people still want to have the lifestyle choice and they are confident to control it, and probably they are more happy to just have stronger restrictions in place to prevent the harm spreading to minors and 3rd person, as well as own addiction.