I can't fault anybody for wanting to do their own thing, and hey if they like it, they are the only person they need to please. That said however, the practicality of having too many paths will be an issue. There is only so much velocity and volume to the smoke your putting out. I believe with 4 stacks, you will look more like a small factory belching smoke into the sky, with the virility of a 98 year old. You'd be lucky if the smoke didn't just fall out into the bed.