I second this. I don't even burn candles in my snake room because the chemicals and oils it releases into the air are harmful for them. Generally speaking, if it's something you wouldn't use around exotic birds, it's something you wouldn't use around reptiles.Just because they can't tell you they don't like it or that's bothering their one lung doesn't make it safe. I liken it to being in a room with smokers. We don't know exactly what damage may or may not be caused by second hand smoke, but why force your snake to endure the potential health risks? Even if it's just incense, why take the chance of harming your pet?
To the OP, close the door and open a window.