Eversmoking Bottle

Smoke leaks from the lead-stoppered mouth of
this brass bottle, which weighs 1 pound. When
you use an action to remove the stopper, a cloud
of thick smoke pours out in a 60-foot radius from
the bottle. The cloud's area is heavily obscured.
Each minute the bottle remains open and within
the cloud, the radius increases by 10 feet until it
reaches its maximum radius of 120 feet.