I converted my big ole, stainless steel gas grill to natural gas when I had natural gas plumbed to my patio. I built the house I'm in so I was able to do that in the construction phase vs. having to come back in and do it later. More to the point, the propane dealer I was getting my LP from drilled the orifice out in the gas grill, making it able to run off natural gas. Variances in temperature are not a question on this gas grill because it is more like an oven on the patio - a Holland Grill. Anyway, before on LP, it would get to 400 degrees and that was it. With natural, it gets to 400 degrees in the same amount of time. I would think that if you were to take the orifice out of any gas smoker and take to a LP dealer, he/she should be able to drill it out and make it such that you could run natural through it. I found that most LP grill manufacturers either don't offer a natural gas orifice, or to purchase one would be costly. But most gas grills don't last for year after year, like mine has. I just got tired of fooling with the LP tanks and converted.