Ha. Good thing I don’t depend on pool for a living, and can just avoid any conflict.
If you need to take frequent smoke breaks, your opponent had better also be a smoker.
Ordinarily, I run to the BR only while my opponent is racking, but, reasonable/cooperative players seldom have issues regardless:
My most game, fiercely competitive regular opponent would schlepp himself in a wheelchair to the BR all the way to the other side of the building, haul himself up onto the commode, deal with a long-standing bowel disjunction issue, and then reverse the process while I waited patiently in the chair. I never complained, nor (I hope) gave him cause to.
Re: subtle sharking: If I even suspected it, then no rematch (life is too short). IMHO: Cellphones (like jukeboxes & jump cues) should be banned from poolrooms. You cannot fulfill your duty as referee and surf the net simultaneously.