Define non obstructive coronary disease. The only one I know of is coronary artery spasm, (usually found with cocaine or meth use) this is not a common occurrence. Other types of heart problems are usually related to arrhythmias, which will not be affected by aspirin. Or cardiomyopathies which can occur for a number of different reasons. Aspirin is still the best defense against strokes or typical coronary artery obstruction. Just my two cents. Coming from working in Cardiology for over thirty years.
At 83 I am in generally good health. I have been taking various vitamins, minerals, and other supplements for around 50 years. I began taking 81 mg aspirin about a decade ago. In my annual physical at Kaiser Permanente my doctor listens to my heart but never indicates there is a problem. He looks at my cholesterol and says I should take statins. I said no, I eat a healthy diet, am below 25 BMI, no diabetes, never smoked, and seldom drink, most relatives died between 90 and 103. The only other thing he is concerned about is my low GFI. I think the problem might be that I restrict water before I go for my exam and blood work so I don’t leak by accident. Next time I will drink a lot of water and wear a pad. Am I running a risk with aspirin and no statins?