I remember when I quit smoking and started vaping I had withdrawal symptoms even while vaping with nicotine. I firmly believe that cigarettes contain many other chemicals that we get addicted to which is not in ejuice. Rather just tough it out and suck on that vape.
Like some people said above, the authentic vapes usually have a scratch authenticity code on it which you can then enter on the manufacturer's website to validate whether it is authentic or not. You can ask the retailer directly as well, if they are a good, moral retailer they will tell you if...
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The ejuice is great but it is cold so if you like menthol you'll like it. Enjoy and let me know what you think once you've tried it.