Apparently flax seed oil is supposed to have a nice nutty flavor. Curious, I opened the bottle and smelled it when I got home from the grocery store.
It smelled like my last two years of college: like oil paint.
And then I realized something I should have realized a long time before. Flax seed oil is linseed oil, the binder component of oil paint. Linseed oil is a drying oil, meaning that as the oil film ages it cross links and becomes insoluble, making it good as a paint binder. Other drying oils include walnut oil and safflower oil. Olive oil, on the other hand, is a non-drying oil. You can wait as long as you want to, but a oil paint made with olive oil is never going to dry.
Flax is historically a really important plant. Not only can you make linseed (or flax seed) oil from it, but the fibery part of the stem is what is spun and woven into linen.