Why must men in their 60s have preventive health screenings if they smoked for 40 years?

Men/Women smoked>40. Not only men but men/women who smoked for>40 years need to be screened for copd, coronary artery disease, perpheral vascular disease and other health effects from smoking, as smoking is the cause of all these conditions independent of all the other conditions like hypertension. Hyperlipidemia, type2diabetes mellitus.