FWIW, the iodine number of an oil is what you want to pay most attention to, not necessarily the smoking point.
Oils that have a high iodine number are "drying oils", they polymerize to form the hardest most durable seasoning.
Yes, flaxseed oil is one of the highest.
Avoid oils that are 'high-oleic' ,their iodine number is lower than that of their standard counterpart.
In other words, sunflower oil has a fairly high iodine number, but 'high-oleic' sunflower oil's iodine number is much lower.
Good luck seasoning!
Edited by DiggingDogFarm - 1/26/12 at 10:35am