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You can stop once the smell of smoke is significantly reduced

"it has been linked to a reduction in the thickness of layers in the brain, and to brain lesions, involving areas such as the frontal lobe, which plays a role in voluntary movement and control of thinking, and a decrease in activity in the area of the brain that processes vision," said Silverstein

Theres also the design of the tank itself

While large industrial models provide the greatest power and performance, we doubt you are looking to bolt one of those to your garage floor

These filters cool down the overall heat of your smoke which may cause each hit to be smoother and less harsh/hot