Smokers: Smoking should be allowed.
A person has the right to choose — to smoke or not to smoke.
It's not a very healthy habit, but it's not a crime.
Smoking helps some people to relax. Some people believe that smoking helps shy people to communicate.
Smoking should be allowed in all public places. Non-smokers have to put up with it and shouldn't make such a fuss about it.
Non-smokers: Smoking should be banned.
Every person has the right to healthy life. It's impossible to escape smoke if there is a smoker around.
Family members and / or colleagues have no choice — they have to inhale (вдыхать) smoke together with the smoker. It's very unpleasant to speak to a person who is smoking.
Smoke can cause very serious diseases.
People shouldn't put up with smoking since it's a risk to their health. Smoking should be banned in all public places / in most public places / in some public places.
Example: I support smokers / non-smokers. I believe that smoking in public places should be allowed / banned...