According to the greenmanitoba.ca site,

SMOKE DETECTORS
Up to 10 residential smoke detectors can be put out for regular garbage collection. More than 10 residential or any commercial smoke detectors require special arrangements and approval for disposal at the City's landfill because of the radioactive material in them, so contact 311.

They do have radioactive material in them, but not much.

On Wed, Dec 17, 2014 at 3:31 PM, Trevor Cordes <trevor@tecnopolis.ca> wrote:
OK, completely 100% off-topic, not even remotely unix related.  But
where else can I get the ear of a bunch of Winnipeggers?

Where the @#%^@ do I recycle fire alarms?  E-waste won't take it
because it contains hazardous material.  Nothing on the City of
Winnipeg site mentions fire alarms, even in their search function.
Google doesn't know.  The normal liquid-hazardous-waste place doesn't
list them as acceptable.

So what does one do with these things that contain radioactive
material?  Next step: garbage, as I'm sure 99.9% of Winnipeggers do.
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