What are the typical causes of artery blockage requiring a stent with a patient has low cholesterol?

Blockages. Even people with low cholesterol can form blockages, so that may be a cause. Also elevated triglycerides can cause blockages and are different from cholesterol. Smoking can cause blockages. There are also some types of vasculitis that can cause blockages due to inflammation.
Smoking heredity. Smoking is probably the main culprit. If you have never smoked, it can be due to your genetic makeup (heredity) or some very unusual causes of increased clotting.