I think this is just a mistake or miscalculation on the author's part. I use one of these devices every day and anyone who's familiar with the operation would e

I think this is just a mistake or miscalculation on the author's part. I use one of these devices every day and anyone who's familiar with the operation would easily be able to tell when it's overheating; the vapor becomes uncomfortably hot and smells different. This will happen when you heat the element for maybe than 7-10s, the frequency per hour has never made any difference in my experience.