Sad it is, but it’s not exactly on the same scale. Being Traif is absolute. Every person, upon the first bite, ate Tarfus. Smoking is statistics and down the line and we all know smokers who lived long. Many things are dangerous, including bad diets which are probably more harmful than smoking.
I overheard in a conversation someone quoting an Hatzalah member that he has seen ninety year old smokers but never a ninety year old obese person.