The main reasons for false alarms in smoke detectors are: 

1.Cooking: Many false alarms caused by cooking are triggered by ionization alarms, as these sensors are sensitive to very small smoke particles, even those that are not visible to the human eye. Solution: Consider using a photoelectric smoke detector. Photoelectric alarms are less sensitive to small smoke particles, reducing the likelihood of false alarms due to cooking. 

 2.Steam or Moisture: Steam or high humidity can accumulate on the sensor and circuitry, potentially triggering a false alarm. Solution: Install the smoke detector away from sources of steam and moisture. For example, avoid installing smoke detectors in hallways near bathrooms to mitigate this issue. 

 3.Smoke from Cigarettes: In general, smoke detectors do not typically respond to cigarette smoke unless it is highly concentrated, such as when many smokers are smoking in the same room. 

 4.Dust: If a smoke alarm repeatedly goes off, it may be due to excessive dust accumulation inside the smoke chamber of the alarm.