That is the auto-shutoff. After 18 seconds of inactivity it turns itself "off". Read: the power stops going but the switch is still in the "ON" position. Thats what you have to click it twice. What is technically happening is that you're just turning it off, then turning it back on.
Right, I understand that now, but it's not addressed or referred to in any way in the GH operating instructions. My point is, it really should be.
One more very minor quibble that I forgot to mention in my earlier post: I was a little surprised that there was no cleaning tool included with the GH. Even the cheapest, shittiest vapes I've seen out there include a little cleaning brush.