Initially, their performance did not meet the expectations of users.[266] The e-cigarette continued to evolve from the first-generation three-part device.[27] In 2007 British entrepreneurs Umer and Tariq Sheikh invented the cartomizer.[267] This is a mechanism that integrates the heating coil into the liquid chamber.[267] They launched this new device in the UK in 2008 under their Gamucci brand[268] and the design is now widely adopted by most "cigalike" brands.[27] Other users tinkered with various parts to produce more satisfactory homemade devices, and the hobby of "modding" was born.[269] The first mod to replace the e-cigarette's case to accommodate a longer-lasting battery, dubbed the "screwdriver", was developed by Ted and Matt Rogers[269] in 2008.[266] Other enthusiasts built their own mods to improve functionality or aesthetics.[269] When pictures of mods appeared at online vaping forums many people wanted them, so some mod makers produced more for sale.[269]
In 2008, a consumer-created an e-cigarette called the screwdriver.[266] The device generated a lot of interest back then, as it let the user to vape for hours at one time.[269] The invention led to demand for customizable e-cigarettes, prompting manufacturers to produce devices with interchangeable components that could be selected by the user.[266] In 2009, Joyetech developed the eGo series[267] which offered the power of the screwdriver model and a user-activated switch to a wide market.[266] The clearomizer was invented in 2009.[267] Originating from the cartomizer design, it contained the wicking material, an e-liquid chamber, and an atomizer coil within a single clear component.[267] The clearomizer allows the user to monitor the liquid level in the device.[267] Soon after the clearomizer reached the market, replaceable atomizer coils and variable voltage batteries were introduced.[267] Clearomizers and eGo batteries became the best-selling customizable e-cigarette components in early 2012.[266]
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