That was pure speculation. Here's a clip from an article that seems a little more in the know.
http://www.vapehit.co.uk/info.php?articles&articles_id=22
In China, manufacturers must obtain nontoxic testing permits to regulate the amount of pure nicotine that is mixed with e-liquid batches, but no other documentation is needed to produce and distribute. Some concern has been raised over the quality of ingredients used in Chinese manufacturing, but no substantiated evidence has been brought forward to discredit Chinese manufacturers. Many Chinese companies comply with standards implemented by the International Organization for Standardization (ISO).
Manufacturers in China of e-liquid now have stringent hi-tech manufacturing plants with advanced quality control, and also offer certifications of MSDS and TUV VOM in order to comply with a reputable standard of quality together with a standardised safety module of their products having undergone an array of tests over their e-liquid contents