If you have a desk job and you want to vape to your heart's content without anybody being any the wiser, here's an idea: a condenser box that you put under your desk and exhale your vapor into in total discretion. All you need to make one is a large cardboard box with thin cardboard walls, some box tape, an aquarium hose and an aquarium ball valve. Put tape around the edges of the box nice and tight, and anywhere the box might leak, so that any pressure inside diffuses only through the cardboard walls. Slip the hose through the box and stick some tape around the hose. Install the valve at the end of the hose. Then place the box somewhere discreet and the end of the hose near you above your desk, so it doesn't raise suspicion. Here's what my box looks like: Here's what it looks like under my desk: it looks like some parcel I just received from the shipping department, that I stored there, and the hose isn't visible without looking under the desk: And here's what the end of the hose looks like on my desktop when the hose is stowed away: How to use it: open the valve, blow the vapor into the valve, close the valve and voila: no vapor whatsoever, even if you vape at full power: What happens is, the vapor gets "stored" inside the box where it has time to get absorbed partly by the cardboard, and diffuse slowly through the cardboard walls between tokes. As far as stealthiness is concerned, the worst that can happen is, someone walks in on you and finds you blowing into the valve. It looks so odd that you just have to make up some cock and ball story and your visitor will swallow it hook, line and sinker. At any rate, however odd it looks like, it most certainly doesn't look like vaping - especially since it lets absolutely no vapor out. It's not just a theory: I've been using that thing for months and it really does work.