My Grandpa was a heavy smoker and smoked a couple packs of cigarettes per day and died at age 60 of lung cancer and it was slow painful death for him.
So he decreased his lifespan by at least 30 to 37 years since my other grandpa is 97 and still living right now and pretty healthy and never smoked in his life.
The age that a smoker will die depends on how many cigarettes the person smoked per day.
But being a smoker decreases your lifespan by at least 10 years and if you're a heavy smoker the smoking can decrease your lifespan by at leas 20 years.
So those who smoke daily die a premature death of at least 20 to 10 years earlier than a non smoker.
Smokers die of lung cancer, heart disease and heart attacks.
Even if the smoker quits smoking by age 40 they reduce the risk of dying early from smoking related diseases by 90%