There are many different brands of nicotine-free puff bars. Some are disposable, some are reusable, and some are hybrid devices that offer a combination of the two. For example, a Voom Labs Voom Pod comes with an interchangeable battery, and its replacement pod can be replaced with another one that will last for several days. In addition, it comes with a 280 mAh battery, which is more than enough to last the equivalent of about 20 cigarettes.