And lung cancer is not the only cancer caused by smoking.
In any case, cancer death rates and changes in risk factors do not speak directly to the claim about treatment effectiveness. If you are diagnosed with cancer, you are basically every bit as f'ed today as you were 50 years ago, except in the special case that your cancer happens to be one of those that never would have been noticed back then.
And lung cancer is not the only cancer caused by smoking.
In any case, cancer death rates and changes in risk factors do not speak directly to the claim about treatment effectiveness. If you are diagnosed with cancer, you are basically every bit as f'ed today as you were 50 years ago, except in the special case that your cancer happens to be one of those that never would have been noticed back then.