Can smoking lead to aortic aneurysm?

Yes: Smoking can cause the atherosclerosis or accelerate it and its also known to cause aortic aneurysm.

Arteriosclerosis: Cigarrette smoking accelerates the process of arteriosclerosis which in turn results in atheroma formation with its multiple consequences depending on location.In the aorta it results in cystic medial necrosis leading to aneurysmal dilatation or the opposite, arteriosclerosis obliterans.

Yes.: Physicians and researchers are not quite sure what actually causes an AAA to form in some people. The leading thought is that the aneurysm may be caused by inflammation in the aorta, which may cause its wall to weaken. While smoking alone may not be the only cause (a matter of debate and research), smoking has been proven repeatedly to increase the rate at which small aaa's grow and increase risk.