What is the principal reason for smoke alarms not functioning?

Over a recent three-year period, an analysis was undertaken of people that died in homes where smoke alarms were present but did not work. 85% of those victims did not have a functioning smoke alarm because of a dead or missing battery/power source.

Source: Fire Marshal's Public Fire Safety Council

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1. Are smoke alarms effective?
2. What is the principal reason for smoke alarms not functioning?
3. Which type of alarm is more effective?