Good luck if they find one!
I have the opposite problem, a thickening/partial blockage, which medical opinion blames firmly on smoking. Smoking, they think, causes abscesses inside the artery. Where it is, the surgeon is reluctant to operate, as there are so many nerves around there controlling the organs in my lower trunk, and the possibilities of side-effects are appalling. That's what I mean by Good Luck.
I'll live with my problem until I'm "Old enough to insert a stent."