In my grandfather's and father's generation, almost all men smoked. Serving members of the armed forces received a cigarette allowance, and most men were either conscripted (in wartime) or did their two years national service.
One grandfather died of lung cancer at 59, two years after being given radiotherapy, then "sent home to die" as nothing more could be done for him. I remember him being frail and bedridden all that time, and my grandmother having to look after him. You think losing a couple of years at the end of your life is something unimportant? Try it and see, or try spending a couple of years caring for a sick husband and then not having him around for the rest of your life.
Of that gandfather's children, the two sons (ex-forces) both smoked heavily, and both died of cancer, one of lung cancer, the other stomach cancer. Yes, tobacco smoke causes cancer in other places besides the lungs. It is implicated in many tumours, including in the mouth, oesophagus, stomach, intestine, bladder, plus others. Everywhere the tars or juices reach,, and also where the bloodstream carries the cancer cells to form secondary tumours (metastases) The two daughters, who did not smoke (women didn't smoke very much then) did not develop cancers. That was ALL the men (smokers) in the family, but NONE of the women (non-smokers)
My other grandfather (also a smoker) developed a stomach cancer in his early fifties, but he was "lucky" - it was found and removed before it had spread to liver and/or lungs, and he survived. However, the effects of the surgery left him with digestive problems for the rest of his (long) life. His wife, a non-smoker who had nevertheless lived in a house with several smokers, did not develop it - but toward the end of her (also long) life she did have a lump in her stomach. It was not investigated further. Of their six children, three out of the four sons (all ex-service, all smokers) died of colon cancer, one of them in his fifties, the other two in their early seventies. The two (non smoker) daughters did not, but they both had stomach ulcers at one point of their lives, possibly as a result of living with smoker husbands. One of those husbands (ex-forces) died of liver cancer.
Final tally - almost all the smokers in my family have died of cancer - not suddenly, after a lifetime of happy inhaling, but slowly and painfully, and after tens of years of impaired lung function and circulation before the cancer, then two to five years of surgery, chemotherapy, radiotherapy, increasing breathlessness, immobility, and dependence on others for basic care. Some of those who didn't smoke at all, just breathed in the second-hand fumes, also suffered the same fate.
I wouldn't say that it was worth the cost.