How should I approach a co-worker on matters of personal hygiene?
I spend 3 hours of my time on an average everyday in meeting rooms. The rooms are generally very small and people sit close to each other. I have few colleagues (from another team) who smoke cigarettes. Some are contractors from another vendor and some are regular employees. They come to the meeting room right after smoking. Some of them don't use gums. Some don't wash their mouth either. It smells very bad. It is not only me but my other non-smoking colleagues share the same uncomfortable feeling.
Is it appropriate for me to tell them on their face that they should use gums or wash their mouth before entering the meeting room (I don't want them to think I am rude. I just want to ask politely but the conversation might end up messy)?
Or Should I just escalate and leave the matters to my boss?
Both the above has some probability that they don't heed to my request. As I mentioned, there are some people who are not regular employees. What can be done in that case?
Thanks for helping.