Smoking is bad for human health. In fact, it is the biggest cause of preventable death in the whole world. On average, smokers lose about 14 years of life. Smoking can produce birth defects for babies whose mothers smoked during pregnancy. It also causes illnesses such as cancer, damages organs, and makes people more likely to get infectious diseases like influenza.
Unfortunately, despite these health effects, people who have already been smoking can't always stop. The main chemical in tobacco is nicotine, and nicotine is addictive, making it hard for smokers to quit. Although many people enjoy smoking because of the stimulation, they must suffer very unpleasant withdrawal symptoms whenever they are denied tobacco.
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