When a smoker inhales a single "shot" of nicotine from a cigarette the lungs allow the nicotine to pass into the blood stream almost instantly. The smoker then feels the "hit" from the nicotine in their bloodstream and this is the sensation that they crave later on. Don't just assume that you're inhaling "pure" tobacco smoke either. That cigarette you're smoking contains up to 4,000 separate chemicals - many of which are extremely toxic.
That smoke you inhale from a cigarette contains 43 carcinogenic substances. These are substances which have been clinically proven to cause various types of cancer. Cigarette smoke also contains 400 other toxins that can be found in rat poison, nail polish remover and various types of wood varnish. Would you willingly eat any of these products? Of course not because you know that they're incredibly bad for you. As these carcinogens and toxins gather in the body they begin to cause serious problems for the heart and lungs.
Of all the diseases associated with smoking cancer is the most common. Cancer is a relatively new disease that has really only become prevalent since the beginning of the industrial revolution. In effect cancer is a manmade disease for which there is, as of yet, no cure.
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