Are there different strains of THC for vape pens? While some dry herb THC vape pens will let you accomplish this, there aren't any dry herb vape pens that assist you to adjust the heat range. THC oil vape pens are definitely more discreet than many other vape pen items since they need a smaller quantity of THC product per session. As long as the unit is charged and clean, you dont should worry about extra cleaning materials or perhaps having...