It seems like there are two toxicity questions with non-briar wood, working the wood as a carver and smoking the pipes once they are made. I have stuck mostly with briar and MM and Old Dominion cobs. I'm sure I would like Falcons with their interchangeable bowls, and Meerschaum, especially the ones of simple classic shapes and designs. I just don't need whole new categories of pipes to spike pipe acquisition disorder. I do have four (I think it is) Mountain Laurel pipes, and these have worked over the years without a problem. I do have one Cocobolo bent pocket freehand, and it has not caused a problem. But I think it is wise to take the tox question under advisement. I think Mountain Laurel was called into question when the wrong parts of the plant were used. Caution makes sense, and especially if you are carving pipes and stand to inhale the dust, which is a different exposure than smoking a pipe, especially after a carbon layer has been established. Caution is warranted, to my mind.