Many are still unknown to the fact that tobacco in cigarettes is blended using two types of tobacco leaves, which have about 2.5% to 4% nicotine. The cigarette is made to offer a steady dose of nicotine to the smoker.

In addition to the tobacco leaf, the cigarette contains fillers obtained from other parts of the tobacco plant and they are mixed with various flavours and additives. The additives boost the acceptability of the cigarette to the smoker as well as increase the addictiveness of cigarettes.

During inhaling, it is revealed that the cigarette burn at 700degree at the tip and 60degree at the core. The tobacco is broken down to produce numerous chemicals, which are released into the atmosphere in form of invisible gases and particles, with the smoke contribute to 5% to 8% of a cigarette's output.

The gases include carbon monoxide, formaldehyde, hydrogen cyanide and dimethylnitrosamine. The particles include nicotine, benzene, benzopyrene and tar.

When the cigarette is lit, the nicotine evaporates. It is absorbed very rapidly by the body and reaches the brain within 10 to 15 seconds.

Nicotine hampers the central nervous system there by affecting the immune system and increases the heart rate and blood pressure, resulting in an increased need for more oxygen.