How about how much tax money will be gained from having alive and healthy people earning money and paying taxes? I bet it's going to be more than whatever cigarette tax will be lost...
https://www.nzherald.co.nz/nz/smokers-save-govt-cash-says-re...
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6813084/
> Deaths due to lung cancer represented the 28.90% and the 10.83% of all cancer-related deaths in 2017 in males and females respectively, with an increasing tendency in this last group. In addition, the YPPLL count increased in the study period among females. Lung cancer was responsible annually for 60,846 YPPLL, and productivity losses summed €13.1 billion over the 10 year period.