Smoke, chemical clouds, and other gases and vapors expand slowly from their points of origin. This is handled like a slow-moving explosion. Every gas cloud possesses a “blast increment” and expands to each increment on the Initiative Count of its release.
During the first round after its release, gas expands out to its second blast increment, during the third round after its release, it expands out to its third blast increment, during the sixth round after its release, it expands out to its fourth blast increment, and during the tenth round after its release, it expands out to its fifth blast increment.
Thereafter, gas lingers for 2d4 minutes before dissipating from the outside in, losing 1 blast increment per minute until it’s gone.
In a light wind, a gas cloud may expand to only its fourth blast increment and dissipates twice as fast. In a moderate wind, a gas cloud may expand to only its third blast increment and dissipates three times as fast, and in a strong or severe wind, a gas cloud may not expand and dissipates immediately.
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