Is your first impulse after using cooking oil to toss it? Resist it: There are other things you can do with used cooking grease.
For starters, cooking oil can often be re-used—for sauteing other dishes, as an addition to things like vinaigrettes, for example. But before you figure out if you can re-use cooking oil, you have to understand when this ingredient starts to break down, which is called the smoke point.
Once oil is no longer re-usable, there are smarter, safer ways to discard it than simply tossing it with no preparation into the trash. Figure out how to get the most out of your cooking oil and get rid of it when you’re done, use this helpful graphic.
Source: Fix.com Blog