In addition to the smokers themselves, cigarette smoke is also dangerous for people around them. Smoking in front of children does not only make them become passive smokers, but psychologically do them interested to take cigarettes.
Children, who often see their parents, siblings or neighbors smoke, become interested in it. It makes them follow the habit and eventually become smokers too.
Some children see smoking is not bad because their parents also do, especially when they know it is almost certainly done by teenagers.
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