Ahh I think you mean like the old idea of smoking break rooms, which sure everyone in there is by choice and accepts any risk.
I dont think your analogy of driving a car fits as driving has utility it reminds me of my yank friends arguing we should allow guns or ban knives because to do otherwise is hypocritical or something
The way the UK government has handled the whole smoking thing is a joke either fuckinhg ban it or don’t. The way they are doing it while helping in some ways makes it better in others it makes it worse as you have pointed out.
I just want to get my shopping without worrying about random asthma attacks