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I wrote a blog going over the inefficiencies of these products here: http://vapepenreviewhq.com/herb-vape-pens/truth-herb-vape-pens/ Hope...
I actually just wrote a guide on this today! Hopefully this can help on of you that still have some questions. Please let me know if you like...
I am a huge fan of the Omicron and Persei but like somebody said above it can be a bit expensive.