original passage: With care, a briar pipe can last a very long time without burning out. However, due to aggressive (hot) smoking, imperfections in the wood, a hole can be burned in the tobacco chamber of the pipe. There are several methods used to help prevent a wood pipe from burning out. These generally involve coating the chamber with any of a variety of substances, or by gently smoking a new pipe to build up a cake (a mixture of ash, unburned tobacco, oils, sugars, and other residue) on the walls.
original sentence: These generally involve coating the chamber with any of a variety of substances, or by gently smoking a new pipe to build up a cake (a mixture of ash, unburned tobacco, oils, sugars, and other residue) on the walls.
sentence2: If oxygen was able to penetrate into the cake on a pipe while it was in use, would it have any effect on the tobacco that was mixed into that cake?
sentence1: With care, a briar pipe can last a very long time without burning out. However, due to aggressive (hot) smoking, imperfections in the wood, a hole can be burned in the tobacco chamber of the pipe. There are several methods used to help prevent a wood pipe from burning out. These generally involve coating the chamber with any of a variety of substances, or by gently smoking a new pipe to build up a cake (which consists of charred tobacco, along a mixture of ash, oils, sugars, and other residue) which remains intact and unburned on the walls.