I smoke pack, drink 12 a day. 50 y.o. and haven't seen a doctor in 15. what are the most essential tests i need? walk an hour and eat healthy.

Smoke and drink: It would depend on symptoms like shortness of breath at rest or with exertion (on your walks). A comprehensive blood panel, and even chest x-ray. Spirometry if wheezy or shortness of breath. A thorough physical exam of course and possible EKG or stress echo if symptoms of heart disease or significant family history. Wellbutrin, (bupropion) chantix, nicotine gum/lozenges/patches work to help stop smoking.