U can use regular cooking oil. I have, it worked great.(it was vegetable oil) I used the oil in fudge brownies. I have also made cannabutter, and margarine lots of times. I just heat the butter/oil/margarine on a stove on med-lo for about 30 min. Then i strain the bud out, and proceed to bake myself some goodies. I think the reason that it works is because THC is fat soluble, and vegetable oil is a fat. Not sure tho, anyways good luck