Does smoking really so dangerous ?

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I have just read an article about the medical and health effect of smoking,it describes the relation between smoking and cancer , and states that smoking is responsible for a huge number of death worldwide due to many kins of cancers especially lung cancer,and the articles states that smoking is the major factor for lung cancer. although we hear such issues everyday, we can clearly notice several things related to this : 1) the number of smoker in the whole world is increasing and becoming more and more 2) new brands of tabacoo is always being made 4) ads related to smoking fullfil the streets,magazines,TV,newspapers...... 3) the ministries of health in all countries don't forbide the use of tabacco, it is leagal 100 % to use it wherever/whenever you are. so how can you explain this ? do you think that there is not really such kind of danger from smoking? are doctor lying to us about tabbacco ? if yes why ? are doctors serious and telling the truth ? if yes why it is still leagal to smoke ? why there is not any law to forbid smoking ? is smoking really a social medical problem ? or a kind of entertainment ?