I have to go to Bunnings at the weekend, I will check out the smoke detectors with a switch. Ours is in the hallway between the kitchen and bedrooms but the smoke still seems to waft up the hall, I guess it is good exercise fanning the detector...but you quickly tire of it
. If we put detectors in the bedrooms, I am afraid the one in the daughters room would keep going off from all the fumes created in there...and I don't just mean smoking either. You have to hold your breath before entering...teenagers!