Jose wrote:
The only "Smoking permitted" suites should be a maintanance-themed
one -
with drums half full of gasoline lying around.

Nawh, that might affect the neighboring suites... Put a high
concentration of freon in the smokers' rooms... Harmless for the most
part -- until they inhale it through the burning embers of the weed
that they're smoking...

Phosgene gas...