What is the pitch of cigarettes?

Pitch in this case is not any concrete substance, and all that remains on the filter of the smoking car minus nicotine and water.
Pitch is a mix of hundreds substances with various toxicity and carcinogenicity which make a sticky deposit, отлагающийся in lungs of the smoker. The structure of pitch at different tobacco products can strongly differ and, hence, their harm for a human body can differ.
Among carcinogens present at a tobacco smoke allocate two classes of activators of malignant tumours: polycyclic aromatic hydrocarbons (for example, бензопирен) and specific to tobacco (that is not containing in other natural substances) нитрозамины. Anywhere in the world there are no the rules demanding that the tobacco companies reduced or supervised concentration of these carcinogens in a tobacco smoke. For example, when in Poland have measured the maintenance of two carcinogens in cigarettes of different marks, it has appeared that their level in cigarettes of known international marks was in 3-4 times above, than in local cigarettes though the pitch maintenance in the international marks was less.
Therefore the concept of "pitch" approaches as a basis of regulation of tobacco products a little.