a- e-cigarettes do smell. The fact that you have had few complaints may reflect the fact that people are courteous and do not like to get into arguments. I have very much liked to complain several times about e-cigarettes myself.
b- they almost certainly harm people around you although the harm may be less than that of secondary smoke.
c - your last argument obviously does not apply to the present situation. If you ban e-cigarettes in places where cigarettes are already banned, then this ban would not cause an e-cigarette smoker to start smoking ordinary cigarettes. In fact, the contrary is true -- if smokers can smoke e-cigarettes in places in situations where they cannot smoke ordinary cigarettes, that very well may result in an increase of smoking.
You can smoke your e-cigarettes in places and situations where cigarette smoking is allowed.
b- they almost certainly harm people around you although the harm may be less than that of secondary smoke.
c - your last argument obviously does not apply to the present situation. If you ban e-cigarettes in places where cigarettes are already banned, then this ban would not cause an e-cigarette smoker to start smoking ordinary cigarettes. In fact, the contrary is true -- if smokers can smoke e-cigarettes in places in situations where they cannot smoke ordinary cigarettes, that very well may result in an increase of smoking.
You can smoke your e-cigarettes in places and situations where cigarette smoking is allowed.