I had this EXACT idea, with chai tea, specifically, as well. About two months ago, I harvested some lavender to try out with making into flavoring first, because the lavender was free (grows outside) and the recipe that I found online said that you can use herbs, plants (I love my rose flavor that I bought at an Indian grocery store, their flavors have worked for me with Vape juice), so I only have to pay for the PG/VG that I need to soak it in before I condense it in the oven on low heat for a few hours, then in a double boiler on the stove on low heat for another few hours. My mom's oven broke two months ago, and she only just ordered a new one that will take at least another two weeks to arrive, so I can't complete my experiment. As soon as I have access to a working oven/stove, I plan to condense my lavender. If the lavender turns out strong (I'm afraid that the process will make the flavoring too weak), then the next move will be to do it again with the Chai Tea. I love your idea, Chai Tea sounds like a winner in the flavor department. I wasted some cash on trying flavoring that I found at an expensive grocery store in my juices, the presence of 'sunflower seed oil' is something to avoid in flavors that you intend to vape on, because the sunflower seed oil's flavor will overpower the taste you want. I'll re-post about the lavender as long as this thread isn't closed by the time I finally try this experiment out. I'm sure my lavender will work because I am using 100% VG to extract it, and will filter out the plant matter, it's just a question of HOW STRONG the lavender flavor will be. The same could be done with the Chai tea, you just need to filter it out before you add it to your juice.