However, as a JW I would have probably refused to drink it viewing it as something similar to a product derived from tobacco leaves. I'm not sure if there's an official WT policy on this tea, but my instinct tells me there probably is.
As a JW you have no saying on anything, including simple on-the-spot decisions that every single adult in their right mind can/should do for themselves, like choosing tea based on herbs that you might or might not know of.
The WT and the JWs have one simple policy, which is "You don't have a saying in your own life".