Unroll adequate foil to kind a pouch large enough to carry a handful or two of wood chips. Drop All those chips in the course of the foil then wrap it tightly. Have a knife and poke holes all through the pouch small enough to Allow air in and smoke out without having letting the Wooden chips tumble out. The photographs under provide you with how

The air reaches the little air sacs (alveoli) from the inner Section of the lungs with any dust particles that prevented the defences within the nose and airways. The air sacs are extremely important because, by means of them the human body gets oxygen and releases carbon dioxide.Back again to major Workers could be influenced by a range of disease