What is the difference between a manual and automatic e-cigarette?

While most e-cigs you find will probably be automatic there are some out there that are manual. There is a button the battery for manual e-cigarette’s that you need to press down while inhaling. The button will activate the atomizer which will vape the liquid and turn it into water vapor. On automatic battery’s a flow sensor is activated when you inhale and does that for you. There may be a slight difference in the amount of vapor you can get with a manual but for the average user there is no real advantage (or disadvantage) to using one.