Earlier quoted context omitted.
It should also be clear that not using electronic cigarettes is better than using them.
I've never seen anyone argue they are harmless, just that they are less harmful than actual cigarettes. The problem is that places are banning e-cigs, which presumably drives people back to smoking. Which is worse for everyone.
Only difference between US municipalities and other markets is that it is masqueraded as an endorsement for good under a respected system of due process (even though it is often unilateral decisions by unelected officials at health agencies with delegated powers)