Abdominal aortic aneurysm presentation workup

A 67-year-old male with a history of cardiovascular disease is undergoing evaluation for a suspected abdominal aortic aneurysm (AAA). Among the following, which is considered the most important modifiable risk factor for the development and expansion of an AAA?

1: Hyperlipidemia
2: Hypertension
3: Smoking
4: Age