In the past couple of months I have noticed more and more people doing this. It is really discreet and if done right nobody knows. The device is like a thumb drive and there is no smoke. If you hold the smoke (or whatever it is) in the lungs long enough nothing is exhaled. I have seen people do this in front of security and security never knew what was going on. The people were dancing, hand to mouth, inhale, keep dancing. The future of getting high at shows.