False Alarm / Smoke - how to deal with it

Hello All! This may sound like an ODD question, but nonetheless, here goes. We purchased our house pre-built around 30 years ago. It came with two hardwired smoke detectors - one on the upstairs hall wall (between two bedrooms), and the other on the ceiling of the downstairs hall between the kitchen, family, dining, and living room. Note, this is a small Cape Cod, \