I think Antrocles was one of the first to extol the virtues of the GVG.

My first time using the GVG led to a similar result – I started inhaling, but was convinced I was doing something wrong. I couldn’t feel any harsh vapors. No taste, no smell, just warm air. I was sure I hadn’t inhaled anything other than air. And then suddenly, I began to feel some very familiar sensations, and I knew it was working.