You can use any oil you like, provided you take it in a way that renders it flavorless. If your corn oil has a flavor/aroma, however subtle, you'll need to clip your nose or something similar to make sure you can't taste it *at all.*
I haven't heard of anyone using corn oil -- the big question I'd have is whether it's easily digestible. Different oils affect people differently, and any of them can produce gastric discomfort, especially early on. But I can't think of any reason offhand to not try it.
A lot of people do use canola oil, which is probably cheaper than ELOO, if not cheaper than corn.