I have been working on a new method to stealth vape, and its worked out quite nicely. No holding my breath, and I can vape in plain sight, but since I exhale no visible vapor, people have nothing to complain about. I take a mouthful of vapor from my pv (like a 5 second drag) holding that vapor in my mouth, while exhaling and inhaling through my nose with deep breaths. On the first part of every inhale, I take in a portion of the vapor (about a third or fourth) I've been holding in my mouth, then exhale only through my nose. Its accomplished by dropping my tongue in the back of my throat for a moment. I've never looked into it, but I assume thats how everyone chooses to breathe through just their nose or both their nose and mouth.... correct me if I'm wrong. I don't produce visible vapor this way and can breathe normally while chain vaping in public places. Its worked out well for me so far. No complaints. Takes a little practice to get right, and a little more to make it an unconscious habit. Only problem is you can't carry on a conversation while doing this.