How destroyers laid smoke screens

How did destroyers generate the smoke screens used to hide ships and formations?

They could alter boiler combustion, use a dedicated smoke generator, or deploy chemical smoke pots over the side.

Warships had three practical routes to a smoke bank. Fuel could be introduced into the burners so the funnels produced dense smoke, or a dedicated generating system could discharge through separate tubing. Ships could also deploy dustbin-sized smoke pots, with later versions ignited electrically. A smoke screen was therefore a deliberately produced tactical obstruction rather than ordinary funnel exhaust.