Heart attack buddy : clogged arteries from smoking, increased atherosclerotic plaque instability, exercise, plaque emboli, heart attack. Even non-smokers can get this, exercise should be gradual. (You try to get heart patients out and ASAP post-MI, low intensity cardio and slowly increasing). Besides, smoking increases sudden death risks significantly
Strokes: Everybody can get them. Smoking increases your risk drastically.
Pneumonia, smoking 20+ cigs a day triples your risk of acquiring pneumonia.
Basic principle, stop smoking or increase your exercise. Just like thin sedentary and overweight very active inidividuals have the same heart disease level, you try to compensate. Besides your buddy with the MI during exercice, the other 2 cases have no link with exercise in general
For heart disease overall, smoking and blood lipids (more so LDL-c) are the 2 main factors in reducing your cardiovascular risk.
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