Excellent idea! Where’s a good place to purchase base?
lots of good places.here is one. UnFlavored Nicotine E-Liquid Base
I was going to suggest this, but with a cheaper solution...
Instead of using unflavored nic juice, just use unflavored a 0mg VG/PG mix (in whatever ratio you prefer) - no nicotine - but you'll still get whatever nic is left in the juice that is left in your tank/coil that you're trying to clear out for the next flavor.
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