Evaluate how sustainable actions to ‘reduce, reuse’ apply to smoke detectors and what you can do to contribute.

1. Reduce: The first step in sustainable action is to reduce. In the context of smoke detectors, this could mean reducing the number of smoke detectors used in places where they are not necessary. However, this should be done carefully, as safety should not be compromised. Another way to reduce is to choose smoke detectors that have a longer lifespan, thus reducing the need for frequent replacements.

2. Reuse: Reusing is a bit tricky when it comes to smoke detectors because they are safety devices that have a certain lifespan, after which they are not effective. However, some parts of the smoke detector, like the plastic casing, can be reused for other purposes instead of being thrown away.

3. Recycle: Most smoke detectors contain small amounts of radioactive material, so they can't be thrown away with regular household waste or recycled in the usual way. However, many manufacturers and retailers offer take-back programs where they will dispose of your old smoke detector safely and recycle the parts that can be recycled.

4. Safe Disposal: If recycling is not an option, the next best thing is safe disposal. This usually means returning the smoke detector to the manufacturer for disposal. They have the means to dispose of the radioactive material safely.

5. Buy Responsibly: Finally, one of the most significant ways to contribute is to buy responsibly. This means choosing smoke detectors from companies that have take-back programs, offer long-lasting products, and have a commitment to sustainability.

6. Educate Others: Sharing this information with others can help increase the overall sustainability of smoke detectors. The more people know about these issues, the more they can make informed decisions.

Remember, every small action counts when it comes to sustainability. Even if it's just choosing a smoke detector with a longer lifespan or returning your old one to the manufacturer for safe disposal, you're making a difference.