i personally have terrible success "just tossing back" JWH. I used acetone to infuse altoids with 3mg JWH-018 each, and I was able to consume 10 of these dried mints with ZERO effect from the JWH. I had read reports online that gelcaps of JWH on an empty stomach give very unreliable effects due to poor absorption (same problem that lipophilic THC has if you just eat bud). thus the dissolution into a quickly-metabolized fat. i have also read that JWH dissolved into everclear (pseudo-green-dragon style) gives a dysphoric high but I haven't had the chance to try it myself yet.
If you dissolve it into fat, you can even control how quickly the JWH enters your bloodstream. Just like cannabis, the JWH is carried around while bound to the fat and then released once in the blood. Different fats are absorbed at different rates. Saturated fats and mixtures that are high in saturated fats (milkfat, butter, chocolate, coconut oil, peanut oil, all the 'solid fats') are sent straight to the liver for metabolism into energy by the body, so JWH or THC in butter is the quickest to hit.
Unsaturated fats (the liquid oils like olive oil, grapeseed, "good for you" oils) hang around in the gut much longer before they are sent around the body, so the high may not kick in for 2-3 hours but it will be very mellow and long-lasting once it arrives.
