Buy a smoke detector and sleep soundly. Thatís fine as long as it works. How can you ensure it works? Well you can press the red button that most have but that doesnít guarantee itís going to work with smoke. You can test them with smoke but itís a habit of staining the detector and ceiling. My personal advice being someone who once upon a time maintained smoke detector systems is to use a minimum of two detectors and test them regularly by fitting them in the kitchen. If they donít go off when dinner is ready thereís a problem.