From "Yes, Prime Minister: The Smoke Screen (#1.3)"
It says here, smoking related diseases cost the National Health Service £165 million a year.
Sir Humphrey Appleby
Yes but we've been in to that, it has been shown that if those extra 100,000 people had lived to a ripe old age, it would have cost us even more in pensions and social security than it did in medical treatment. So, financially speaking it's unquestionably better that they continue to die at their present rate.