Unless they are getting liquids and ingredients from questionable sources, the only way high amounts of anything bad, or in fact any really really bad bad stuff, would be if they were intentionally adding those into the liquid. IE using "Poly" Propylene Glycol instead of just regular USP grade PG, over abundance of DA/AP dikeytones, the list is long what can possibly be in juice. I'd study an in house juice making B&M, where their ingredients are coming from, they wearing vinyl gloves (not latex) like in at least a fast food environment, stainless or sanitary benches/counters, hair and/or beard/mustache nets, are they sanitizing their instruments, on an on. B&M "Shake and Vape" juice shops, IMO, no, just no unless they have an ISO5 or higher lab seperate from the rest of the store, and the juice has at least 21days to steep properly.