Disposable vape is popular as it is incredibly simple and convenient to use because it comes pre-filled with amazing various vape juice. Round Disposable vaporizer is the most popular and common. The classic designs of popular brands such as Puff and Bang etc are all round shape. Square disposable vape is more unique and become the favourite in many countries. Blinking disposable vaping device is especially popular in bars. They can be ultra flash in the dark. The vape pen flashing green, yellow or white light. Basically there are two types of inhalation: month-to-lung and a direct-lung draw. Direct-lung hit is mostly ideal for large vapes with low resistance coil, using low nicotine. The nicotine content is the best gauge for how to inhale the vapes. Low nicotine(0mg-6mg) is best for direct lung inhales. High nicotine(12mg-60mg) is better suited for mouth-to-lung. Medium nicotine(6mg-12mg) is okay for both types of inhaling, and typically 6mg is the cut-ff for direct lung inhales. MTL hits makes low vapor and feels like the act of smoking, providing a similar type of hit to the throat that many smokers crave. DL draw makes the most vapor and feels like taking a bong hit, though it is considered smooth and easy. Direct lung inhale is to quickly draw vapor directly to the lungs and exhale vapor almost immediately. MTL is to slowly draw vapor into your mouth for a few seconds, hold the vapor in your closed mouth for a second or two, open mouth and breaths the vapor to your lungs instead of swallow and then exhale after vapor is in lungs.