A ban on outdoor smoking

According to BBC reports, the new Labour government (not to be confused with a New Labour government) is considering a ban on smoking in certain outdoor spaces. This might initially sound quite draconian, given that smoking outdoors is not generally so dangerous to others, but actually the places proposed - thinks like pub beer gardens - are places where one might well be in close proximity to other people's second-hand smoke. Whether or not this is a proportionate measure, it is potentially justified by harm to others, rather than paternalism.