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I am relatively new to vaping and even newer to mixing my own juice, however I am quite intrigued by the caffeinated flavours eg DV doppio espresso and whether they actually deliver a caffeine hit that keeps you alert (could be very useful for long drives).
That got me thinking about using pharmaceutical grade caffeine as an additive to other flavours as it seems pretty cheap (link below) to make some interesting alternatives to an espresso as a pick me up.
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