Teenager taking drugs, alcohal, smoking -- what are the causes

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As most of teenager start smoking, taking alcohals and even sometimes drugs too. who is responsiples for this. may their parents are not interacting with thema nd not giving proper time, or the media and television influencing or the bad circle affect this. what are the main cause. i think if parents give some time to their kids then might be these habbits will in low in number. what you think about that.