Eversmoking Bottle

Smoke leaks from this stoppered brass bottle, which weighs 500g. As an action; remove the stopper and pour out a cloud of thick smoke in a 60-foot radius. The cloud's area is heavily obscured. The radius increases by 10 feet per minute (maximum of 120 feet) and persists as long as the bottle is open. As an action; close the bottle and speak the word "clear". Once the bottle is closed, the cloud disperses after 10 minutes. A moderate wind will disperse the smoke after 1 minute, and a strong wind after 1 ro