I Thought Smoke Detectors Were Supposed to Detect Smoke

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We have lived in this house 24 years now. Wow! 24 years this month. A couple of years back our smoke detectors were beeping. I looked at them and there are expiry dates on them. They're only supposed to be good for 10 years, then they should be replaced. So I bought two new smoke detectors. They are located at entry level just outside the family room and next door bathroom, and on the bedroom level where there are 3 bedrooms and a main bathroom. The problem is, the smoke detector upstairs goes off after anyone has a shower. The STEAM from the bathroom sets of the SMOKE detector. I thought they were just to detect smoke, not steam. We have to open the bathroom window, put the fan on and close the bathroom door for awhile until all the steam clears. Has this happened to anyone else? I really thought smoke detectors were to detect smoke, not steam.