It is common sense that smoking is harmful not only for smokers but also for those who does not smoke and only absorb smoke of tobacco.  Therefore, I believe that we shoud prevent non-smokers from absorbing discharged gasses of smokers in public space. As for me, I am non-smoker and not only feel annoyed but sick to absorb tobacco's smoke.  However, I do not agre with the idea that smokers cannot smoke at all in every public place.  Because some heavy smokers are so addicted to smoking that they cannot help smoking for a long time.  What I would like to emphasize is that if only non-smokers are protected from smoke of tobacco in public space, smokers should be allowed to smoke in the due places.   In this essay,  I will show the reason why smokers should be admitted to smoke in some public place and the proper way of their smoking.
    There are many smokers who cannot stop smoking any longer.  They know well the harm of tobacco, which include some harmful ingredients, like nicotine, CO1 and so on. It become couse of so various kinds of diseases, cancer, heart diseases, high blood pressure that life expectancy of smokers is extremely shorter than that of non-smoker.  Fairing of these diseases, some smokers try to smoking.  However, because of their addiction to nicotine, many of smokers, who have smoked for a long time,  fail to quit.  Without tobacco, they feel uneasy and cannot concentrate on their jobs and other kinds of thing. Therefore, if they are prohibited to smoke all the places except their private homes, they cannot do their jobs efficiently. 
    It is certain that we should stop smoking at all in some public speces.  For instance, we absolutely must not smoke in hospital where patients are everywhere and they might develop their diseases by the harmful gasses.   In schools, whose students are under twenty years old, we should not smoke at all, in case of tobacco's bad effect on immature students.   Of course, if people do not smoke, they should not be exposed on smokers' discharged gasses, since they are not only unpleasant, but also unhealthy.  Thus, in public places, they should be protected from tobacco.
    Thinking about these facts, the best way is making both the place of smoking space and non smoking space in public places except hospital.  You know this is already done.  But I think some smoking place have trouble because of lack of wall between smoking place and non-smoking place.  Flowing smokes nullifies the effort to protection of non-smokers.  To guarantee comfortable condition for both smokers and non-smokers, we should never fail to make wall between smoking and non-smoking place.