When e cigarettes were first introduced in the USA, the options for hardware and e liquid was limited. Although the hardware did not bring up many quality issues, the inconsistencies in e liquid did prove to be a major cause for concern. Initially, there were two ways to buy e liquid. You could either purchase pre-filled cartridges or buy refills to restock your electronic cigarette. Either way, both nicotine solutions were manufactured in China.
While some manufacturers in China adhered to strict quality standards, others provided substandard goods for lower prices. As the quality standards of another country cannot be regulated, the products that are imported should have been subjected to quality control tests. This did not happen as some vendors in the country continued to distribute inferior products to save money.
When these inconsistencies were noticed, several vendors in the country began to produce their own e liquid. Although the e liquids in the United States are considered to be of better quality than most Chinese e-juices, they were not subjected to quality assessment. After testing samples of e liquids manufactured in the country, it was found that several of them contained nicotine concentrations that were much higher than labelled. One brand was found to contain more than 200% nicotine than mentioned on the label! This prompted local manufacturers and vendors to regulate the quality and nicotine concentration in the e liquid.
Quality of e liquids is generally measured through flavour and nicotine strength. To get the best quality e liquid, you could check out reviews on the internet as well as e-magazines that cover different brands. You could also contact the company and pose a few essential questions. Ensure that you ask about their manufacturing unit as well as sterilisation methods adopted. Make sure that the company uses FDA approved products and food grade ingredients. You should also ensure that the e liquids do not contain any ingredients that you are allergic to.