There are still tons of studies going on, and normal consistent Testosterone levels don't cause problems and increase your risk of heart attack and stroke. There are tons of problems when there is to low testosterone.
What does increase your risk of risk factors for heart attack, stroke, cancer, is lifestyle factors. Obesity, salt intake, Food choice - lots of fried and processed food, diabetes, sugar intake, sleep, stress, lots of abdominal fat, smoking, alcohol consumption.... ect.
There are lots that are concerned about stroke and heart attack, the call for concern is how overweight are you for your frame? And how healthy is your heart and Blood Pressure? TRT isn't going to be what causes the heart attack or stroke, its the other lifestyle factors that will causes the HA or stroke, if the heart isn't healthy enough to function, then it's not TRT that's the problem.