Does not seem to be the best tool for a task to me either.
If matters get serious, then smoke is going to not only have some think fire, also reduce vision for first responders arriving and those civilians trying to evade.
One does not need Panic in a serious situation.
A small key ring light with Strobe feature, such as Inova, sells for ~ $7 some places makes more sense to me.
Light to assist those in need, or strobe to guide first responders toward, or civilians away from danger.
In a marine setting ( boat) strobes and compressed air horns are proven.
So are Coaches Whistles.
These are proven with civilians signaling for assistance when power and utilities are out as well.
Blast the horn, use whistle, as one may not be able to yell due to injuries, add horns and whistles carry further.
Vehicles, do well with strobes, hence the reason school buses have then and other vehicles.
Light sticks in a vehicle can also aid first responders, just as they do aircraft when they have a problem.
Balloonist also keep these strobes, horns, whistles and lights to assist pick up teams when they land in fields.