Unless we have finer data, I would assume that 2nd and 3rd hand smoke is included in "smoking-related" so in the cost figure. It has also to be much less than actual smoking so will not massively change the NHS cost.

We have already established that healthcare costs are more than covered by existing tax.

Arguing and trying to make up additional "costs" is, again, just fudging the numbers and clutching at straws at this point...

Live and let live.