The company now known as Juul was founded by James Monsees and Adam Bowen in 2007 under the name of Ploom. The company currently has distribution in the United States and Canada and has received $46.7 million in "series C" funding from various sources. The company has been involved with Japan Tobacco International. The Pax by Ploom was the first release of the Pax series.

Next, the renamed Pax Labs, Inc., introduced the Pax 2 including the following changes: no moving parts to maintain, smaller and lighter, larger oven, and longer battery life. Pax 2 can be used with loose-leaf tobacco or cannabis. In November 2016, the Pax 3 was released, featuring compatibility with both extracts and plant matter, new tools and accessories, and a complementary smartphone app. Also, Pax Labs introduced an extract based vaporizer called the Era the same month.

Pax Era operates by heating a concentrated cannabis liquid held in very small containers. Ari Atkins, Pax Labs' R&D engineer, said: "We don’t think a lot about addiction here because we’re not trying to design a cessation product at all." On June 1, 2015, the company introduced the Juul. Juul is a type of e-cigarette which uses nicotine salts found in leaf-based tobacco. PAX Labs has been given a US patent for their nicotine salt liquid preparation used in Juul.

The e-cigarette is described as being shaped like a USB-drive. The e-cigarette uses nicotine salts found in leaf-based tobacco to create an experience more like smoking than other e-cigarettes on the market. The device recharges using a magnetic USB deck. Each Juul Pod contains about the same amount of nicotine as one pack of cigarettes. Each cartridge delivers approximately 200 hits. Juul strives to deliver a nicotine peak in five minutes, similar to a traditional cigarette. This history lesson is brought to you by yours truly, JuulWraps.