I want to quit smoking, have you good ways to help me?

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Recently, I found my habit of smoking is become harm to my health. I got the serious cough in last week. I think that this maybe caused by the large smoking. And my famfily are also opposing smoking. They think the smoking is harm to the health of myself and family. So I try to decide to quit smoking these days. But I found it is hard to no smoking. You know, when you custom something you will feel something get wrong if you have no it in one day. My friends told to me that some medicine can help to quit smoking. But I do't know if this medice have some side effect or it really work?