Don't put your old clothes on your stand. Don't spread your scent around your stand. The fastest way to spook wild hogs is to introduce a bunch of new human scent into their pristine territory.
If you come home at night, into your own home, and it suddenly smelled like fear, or its equivalent to you, would you continue to go into your home without a thought of your own safety? Or would you leave and get some help?
Wildlife is kind of like that. They go anywhere, anytime. They have no home and reason to go into something that yesterday was OK but today is questionable. There is REAL DANGER for them out there, SURVIVAL DANGER each day every day, and you just showed them the way to it.
Cooking oil? Come on. I have seen discussion regarding diesel fuel, motor oil, and now cooking oil. If diesel or motor oil was so good, why don't they lick the dirt up under the trucks parked at the gate? Too much human scent possibly, but scent doesn't last that long and motor oil and diesel do. I think the discussion is intended to throw off the uninitiated. Don't use cooking oil.
If you want to make a smelly concoction try a 1-gal. milk jug slit to hold 1/2 gal of dry whole kernel corn and fill the rest of the jug with water to cover and float the corn. Hang that over your bait. Its fermentation will bring the hogs in in a couple of days.