To understand sub-ohm vaping, you must first understand resistance. Resistance is the term that expresses how much a component in an electrical circuit restricts the current. Resistance is measured in ohms. If you’ve used a cigalike or a small vape pen such as an eGo e-cigarette, the atomizers that you’ve used to date have always had resistances over 1.0 ohm. A sub-ohm atomizer has a resistance of less than 1.0 ohm. Sub-ohm vaping is a natural evolution in the hobby of cloud chasing. When you increase the thickness of the wire in an atomizer coil, you lower the resistance of the coil. Using a thicker wire also means that the resulting coil will have greater surface area, and more surface area means more vapor production. Sub-ohm coils have plenty of surface area, and they work at higher wattage settings than standard-resistance coils -- and that means bigger vapor clouds.
If you already inhale directly to your lungs -- or you’re willing to do that for bigger vapor clouds -- you should definitely try sub-ohm vaping.
Although sub-ohm vaping isn’t inherently unsafe, a sub-ohm coil puts more stress on a battery than a standard-resistance coil. You shouldn’t buy a sub-ohm tank for use with your current vaping device unless you’re certain that the device supports sub-ohm coils. If you purchased your device more than a few years ago, you’ll probably need to upgrade. Virtually every regulated box mod -- and most larger vape pens -- made today support sub-ohm attachments.
Sub-ohm tanks are the most popular vaping attachments today, and you’ll need one when you get started with sub-ohm vaping. The most recent designs for sub-ohm tanks use very wide atomizer heads with as many as eight -- sometimes even more -- individual atomizer coils inside. That’s the type of tank you’ll want if blowing the biggest possible clouds is your goal. Most recent sub-ohm tanks fill from the top. Just twist the top part of the tank open when you want to add e-liquid. When you want to change the coil, twist off the bottom part of the tank. Twist out the old coil, and twist in a new one. Sub-ohm tanks are convenient to use and produce huge, flavorful vapor clouds. If you prefer sweet e-liquids, though, you may encounter a problem when you get started with sub-ohm vaping: coil gunk. Over time, the sweeteners in an e-liquid form a dark crust on an atomizer coil. After a while, the crust adds a bitter, burned flavor to your vapor. The more e-liquid you consume, the faster the crust will form -- and sub-ohm tanks consume a lot of e-liquid. At $2-3 per atomizer head, using a sub-ohm tank can become very expensive for those who prefer sweet e-liquids.
If you vape sweet e-liquids, you’ll probably be thoroughly tired of coil gunk by the time you’re an expert at sub-ohm vaping. Once you reach that point, the only thing left to do is begin building your own atomizer coils. If you’re okay with learning a bit about electrical safety, you’ll love using a rebuildable atomizer. Rebuildable atomizers generate considerably more vapor than most sub-ohm tanks. Since you can buy a large spool of wire and a package of cotton for just a few dollars, building your own atomizer coils is also a much cheaper way to vape.
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