Is MARIJAUNA really bad for our health?

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i knew someone who use it as a medicine but my parents told me that its not good for our health?Now i dont know who to believe.Someone also told me that it cures cough and a lot more.And someone also told me that once you've tried to used it you will hooked on it forever.Here in our country it is really illegal but i learned that in some country they are very much legal.Why is it?