Correct, I wasn't aware you got similar problems above the legs - and as you say they did one first, with the other later (or would have been).
Yes, my dad stopped - in fact while he was in hospital waiting for the operation a guy on the same ward said he couldn't wait to get back out for a smoke again, and as it happened the surgeon walked in just then. The surgeon said, no problem - you can smoke this afternoon, because I'm discharging you, I'm not wasting my time doing the operation if you're not stopping smoking - there's no point.