SMOK is the leading vape manufacture globally since it's launch in 2010 from Shenzhen, China. In my opinion, it's rapid research and development catapulted this small and young company into the forefront. Initially, a small player in the electronic cigarette market. The brand focused on design. Since it's launch in 2010, Smoktech has innovated and earned a bunch of patents. Many which are found inside of the vape tanks, vape mods, and coils we use today. With an astounding 80 million devices sold worldwide the little company is now king. The brand continues to grow into the premier brand for vaping devices. I personally have owned their products across the board of offerings. From pod mods, box mods, sub ohm tanks, cartridges, vape pods, and replacement coils. This brand has had a historic rise that has made it not only the most recognizable of all vape brands. I believe they are also tied to the vaping experience of a large portion of the vape community. Products from SMOK are backed by a worldwide warranty and any product that arrives defective or not operating. If it arrives not operating as intended. I recommend contacting them via this SMOK Warranty Contact Page to get your product replaced. I believe you will find great value in any product you buy from Smok.