It was found that: smoking and antiplatelet use were associated with a more rapid abdominal aortic aneurysm growth rate; the drug metformin was strongly associated with a slower abdominal aortic aneurysm growth rate; and drugs in the angiotensin-converting enzyme inhibitor, angiotensin II receptor antagonist, and thiazide/related diuretic classes were also associated with a slower abdominal aortic aneurysm growth rate. Here, ACE is linked to abdominal aortic aneurysm.