Use of Commas

Without commas or any other punctuation, this paragraph is filled with run-ons and bad sentences:

before: Smoke is not only damaging to humans but also is dangerous for the structure where it is being performed. From a physics standpoint smoke is less dense than air so it will rise to the top of a room. Considering this the cigarette smoke in a bar or restaurant rises and creates a yellow layer of film on the ceiling. This film is very difficult to remove and can also reduce the value on a building in the future if it is to be sold. Where there are smoking people there will be lazy people. Time after time people do not completely put out their buttes. This means that the end of the smoldering ash is dangerously hot and somewhat on fire. It is common for accidents to happen for instance a server bumps the table and knocks the hot butte on the floor onto a napkin. This napkin in turn starts on fire and spreads under your feet until you notice it and it’s too late to get water. The plain and simple fact is that a single cigarette can burn down an entire building. After the Ohio November 2006 ban the probability of building fires being caused by cigarettes dramatically increased.

When fixed, it makes more sense:

after: Smoke is not only damaging to humans, but also is dangerous for the structure where it is being performed. From a physics standpoint, smoke is less dense than air, so it will rise to the top of a room. Considering this, the cigarette smoke in a bar or restaurant rises and creates a yellow layer of film on the ceiling. This film is very difficult to remove, and can also reduce the value on a building in the future if it is to be sold. Where there are smoking people, there will be lazy people. Time after time people do not completely put out their buttes. This means that the end of the smoldering ash is dangerously hot and somewhat on fire. It is common for accidents to happen, for instance a server bumps the table and knocks the hot butte on the floor onto a napkin. This napkin in tern starts on fire and spreads under your feet until you notice it and it’s too late to get water. The plain and simple fact is that a single cigarette can burn down an entire building. After the Ohio November 2006 ban, the probability of building fires being caused by cigarettes dramatically increased.

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