Some nicotine is made synthetically. Some is exported illegally from China. Where it’s from, how it’s made and the purity of the product matters – a lot.
In short, the quality of nicotine impacts flavor. A low quality nicotine can have an unpleasant taste and deliver a harsh throat hit. In your e-liquids, you only want the best. Ecig Express imports the best and purest liquid nicotine available.