We have CO detectors here too, and but mine only goes off when I push the fridge against it and hit the button.
Addie, I would surely tape a bag over that thing if I could, but the smoke alarm is at least 9 ft up on the wall and I'm a short person and nothing to climb on. Being short really sucks sometimes. But not only that, since I'm living in an SRO (single room occupancy) and it's subsidized, they'd have catfits and kittens if I did that. I'd get a warning the first time they saw it and a ten day notice to vacate the second time.
People really don't pay attention to them. Here we have drills and get yelled at if we don't get out in time (I have a hard time because they close the elevator off and going down two flights of stairs kills my knee), but when I worked at Kinko's once, our store was in a 9 stories tall building and the smoke alarm went off. I was trying to get the customers off the computers and out the door and they just flat out didn't want to leave.