They are just a marketing ploy to trick you into thinking you are smoking a safer cigarette. Unfortunately, some of these chemicals also cause cancer. But not all of the chemicals in your cigarettes are there for taste enhancement. For example, a chemical very similar to rocket fuel helps keep the tip of the cigarette burning at an extremely hot temperature. This allows the nicotine in tobacco to turn into a vapor so your lungs can absorb it more easily.
Most people prefer to use ammonia for things such as cleaning windows and toilet bowls.
You may be surprised to learn that the tobacco industry has found some additional uses for this household product. By adding ammonia to your cigarettes, nicotine in its vapor form can be absorbed through your lungs more quickly. Causes increased susceptibility to lung infections. If you are angry that so many things have been added to the cigarettes you enjoy so much, you should be. Many of these chemicals were added to make you better able to tolerate toxic amounts of cigarette smoke.