definitely tell! I smoked a cigar once at a friend's and then went to a salsa club. Luckily i was dancing with a friend and she yelled at me for my super strong cigar breath. its things like that that made me improve. it sucked that once, but I made a lot of changes based on that incident, and a couple of others. Now, I shower, brush, and eat a mint before i go to a club. And then once I'm there, I have listerine pocket pax on me all the time.