basil, chamomile, dried citrus zest (lemon, orange, grapefruit), chai spice tea, rose petals, mint leaves, lemon balm... Hops are also quite interesting to vaporize if you like that IPA bitterness (though they're nasty when smoked). They can be high in myrcene and other terpenes. Try to get them fresh from a beer brewing supply shop. I haven't tried stronger/oily aromatherapy herbs like cinnamon, cloves, or eucalyptus--just hand-huffing those are enough. Fresh ground nutmeg on top was tasty fun, but look up warnings about nutmeg before trying that. Different pipe tobaccos impart flavorful effects when mixed with your herb, though the nicotine buzz from straight tobacco is more than what I'm seeking...