He’s retired now but one of the arguments being put forward for the ban is that it will help the NHS. Purely actuarially, his anecdotal experience was that people living longer has been one of the biggest factors in the budget being squeezed over the years. Interestingly the other huge money sink was litigation by patients but that’s a separate thing to what we’re discussing.

Edit: Not that it should be relevant but he also smoked for the majority of his career as a doctor. The observation is more about how wider behaviour of the population affected their budgets.