I both lung inhaled and mouth to lung inhaled when I smoked analogs(26 years). With electronic cigarettes(ecigs) I always go straight to the lungs. Their are two ways I control the amount of vapor and air inhaled. The first is to limit the speed which I inhale. Limiting the speed also limits the total quantity of vapor and in some cases fresh air. The second way is to control the amount of additional air mixing with the vapor as I inhale. By loosening my lips I allow air to enter my mouth from around the tip of the ecig. With analog cigarettes the size of the cigarette was so that I could not use and did not need additional air to mix with the smoke. I don't think the second method is instinctive for prior analog smokers, "carbureting" has to be learned. On a device that might have a tighter draw I may allow more air to enter my lungs from around the tip and for devices that have a looser draw I may not bring in any additional air from around the tip. For myself the end result is I always inhale at the same speed for others the end result may be they inhale the same amount of vapor. It's a choice for both lung inhalers and mouth to lung inhalers.
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