Thank goodness. I thought I was going bunky reading about St. Bruno ghosts. Never detected one, and don’t believe the current manufacturer could make a ghost if they tried.....I've smoked St Bruno for years. It's a favorite of mine. I wouldn't say that it ghosts a pipe in the sense that it imparts a flavor that can't ever be eradicated. Yes, you will taste it in a pipe for a few bowls after you have started a different blend in that pipe, but it always goes away. Many blends leave a trace for a few bowls after introducing a different blend to the pipe. St Bruno doesn't really require more diligence to eradicate than most other blends in my experience.
Latakia is a different story. Compared to Latakia, St Bruno doesn't ghost at all.