i say dry mouth, red eyes, and appetite are all VERY prominent for JWH compounds.
the ratio of side effects : euphoric effects (couch lock, head high) is worse for vaporization. oral ingestion has much smoother onset, longer plateau, and uses about the same amount of material compared to vaporization.
i'm very serious, anyone who has not tried these compounds orally is missing out on the best cheap weed replacement ever.
dissolve your standard smoked dose (5-10mg or more if highly tolerant) into a spoonful of butter or oil in a pan on low heat. absorb the fat with a small slice of bread and enjoy on an empty stomach. kicks in around an hour and the high lasts 4-6 hours.
JWH makes a very powerful odorless brownie when added in the correct proportions (ie, for a 12-brownie pan, add 240mg JWH and you'll have 20mg each brownie) start with half of one, and eat the other half to prolong the high at T+4h.