Well, not unless you genuinely believe you won’t die if you don’t smoke.
Given my post clearly spells out that that I'm currently in treatment for cancer, and have never smoked, I'm very acutely ware that non-smokers can die, thanks. As I mentioned, I look at my four year old sometimes and wonder if I'll live to see her reach KS2. Are you always that tactless, or do you just lack reading comprehension skills? 
I also pointed out that lots of smoking related conditions don't, in the end kill, but are very disabling, which again costs the taxpayer an absolute bomb in a whole range of ways, care costs, benefit costs, and loss of workers.
People dying in old age have paid taxes all their lives. They have fully contributed, in so many ways, financial and with their labour. And they are far, far less likely to leave minor children behind them, which also costs the state a fortune in a whole range of ways.
Saying smokers fund their own care just isn't accurate. I've not funded mine, either, but my odds of needing it were heavily reduced by my life choices - I've just been really, really unlucky. And there's a grassy bank opposite the Sutton branch of the Royal Marsden Cancer hospital, full of bald people clutching IV stands attached to their ports and cannulae, and they're puffing away on the cancer sticks. It's astonishing - going through hell to try to live, while sucking on something guaranteed, in their specific cases (because recurrence is far more likely, and there are serious risks while in treatment, too, made dramatically worse by smoking), to kill them.
Smoking is a horrible addiction, mostly started when young, and smokers are victims, not villains. I'm not blaming them. I just think the comforting lies, and insisting that the addiction harms only them, is denial on their part. It harms all of us.