Marie,
It is common to feel like this and want to have everyone quit as you have. Your friends will quit in there own time and you will be there for support. For now love them for who the are, not what they do.
See if you can't make activities and nights out to non-smoking places. I know the smell is bad, but it will be worse if they were able to smoke all night long. Friends will understand :)
Keep Strong,
Josie
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The SSC Support Team.