In 2017 it was estimated that smokers paid an extra £12bn to the taxman but they cost £14bn taking in to account the cost of medical treatment, prescriptions and sick benefits; loss of productivity in the workplace; cost of putting out fires caused by smoking; cost of cleaning up to the local councils.
https://www.telegraph.co.uk/news/2017/10/18/comes-smokers-burden-nhs-may-contribute-tax-take/
Worst thing I ever did was start smoking. Best thing I ever did was stop in 1994 when I was smoking at least 40 a day. I certainly noticed the difference in my pocket and every budget I calculate how much I will save in the coming year by not smoking - roughly £9000 this year. My wife also smoked 40 a day and stopped at the same time, so that's an overall saving of £18k a year.
I save more money than that by not smoking - my outdoor clothes and curtains need dry cleaning less often because they don't stink of stale fags; my home needs decorating less often because the wallpaper and paint isn't stained; my cars sell easier because they don't stink nor have that nasty sticky residue on the roof lining plus no burn holes in the seats or carpets; I spend less on prescriptions as I no longer get chest infections.
For years I had the attitude that I would never stop smoking. I'm so glad I saw sense when I was diagnosed with asthma in 1994.
So, I hate to see people smoking, especially young people.