@feruze-- I think heavy physical activity has something to do with it too. My uncle has had surgery four times so far from cardiac stent restenosis. Each time they place a bigger stent in his artery. Some have lasted several years, but one only lasted eight months.
My uncle is very active though. He travels a lot for his job which is pretty stressful and he loves sports. The last time he was hospitalized due to chest pain and difficult breathing, and where he again had surgery due to restenosis, he was actually skiing!
We tell him to slow down but he doesn't listen.