I avoided being around the smell of smoking for a long time after I quit. A few months or so into your quit or before, being around smokers is offensive and stale smokers stink.
the point of this story is...if you must be around smoking or smokers and you want a reminder you've quit, smear a little vicks under your nose. the smell, and that little burn are excellent in letting you know somethings different and often all it takes if you've willingly quit, is a gentle reminder.
spread the word, vicks is a physical distractions
SOME OTHER GOOD ONES ARE
Stuff your mouth with ice cubes
Stick your head in the freezer and breathe deeply
Bite into a lemon skin and all.
Pour a glass of water over your head
KEEP YOUR QUIT.
NO EXCUSES WITH TOOLS LIKE THIS!