Very sensitive; as soon as the alarm sounds a slight haze caused by a pan which is heated with the steam. But water vapor is not smoke, I felt that our large enough kitchen to 6 people. all our appliances are electric and can overheat and cause a fire! Even at night! In the lounge we have a fireplace and therefore there this winter? surprise perhaps. I may be a bit harsh on those products that prevent smoke but should not at all alert when a little steam escapes from the cooking on the induction cooker, I found the solution, avoiding a ceiling redone hole locations operate the VMC and the hood. I highly recommend it, as this highly sensitive item approved EEC you will meet along the leaflet in French! Thank you for your understanding.