The vast majority of e-cigarettes consumed internationally are produced in China factories, forming the core of a complex supply chain. These operations often operate with a layered

Shenzhen has become/is recognized as/stands as the global epicenter/hotbed/powerhouse for vapor manufacturing. This booming/vibrant/thriving industry is fueled by/driven by/powered by a massive/significant/growing demand for electronic cigarettes/vaping devices/vaporizers worldwide. Factories/Pla