I believe in ghosts. I have been exorcising an aromatic ghost out of a Savinelli Oscar for over a year now. Finally made some progress after finding the ghost a latakia friend. (Fayyum seems to be a good pairing)
Tried the traditional methods, then decided that since I couldn't beat it, it was time to join it....
My first two estate pipes I ever bought were so heavily ghosted with Lakeland blends that I couldn't get rid of the taste. I salt treated each pipe a couple times, and then sent them off to have them cleaned up and they still reeked of Lakeland. To this day I can't bring myself to smoke a Lakeland because of those two pipes. Needless to say I didn't keep them, and I re-sold them on eBay. However, I noted in my auction that while the pipes were cleaned they were previously smoked with Lakeland tobacco's, so that the new owners were well aware that they should be intended for Lakeland blends.
That is sort of an old school view. It seemed that most smokers found a blend or two that they really liked, and stuck with it, sort of like throwing in a tub with the grocery order every two weeks and not thinking more about it.
A lot of the ghosting is definitely in estates. I believe that the old school method of smoking just one or two blends in just one or two pipes all the time has heavily ghosted a lot of pipes on the estate market. These days, a lot of people switch blends in a pipe, rest their pipes between smokes, and generally take an entirely different type of care of their pipes. It seems that ghosting is less of an issue nowadays. But, yes, there are some blends that will outright ghost a pipe. No easy answer here.
Is smoking one or two blends mostly a key to contentment? Whereas smoking an unending parade of blends is exciting but not as satisfying? That might be a different thread. I'm stuck on the adventure of an unending trial of blends, so even blends I enjoy a lot are not re-ordered for a long time, or maybe ever.
Three Days of the Condor (1975): Robert Redford, Faye Dunaway, Cliff Robertson, John Houseman, AND Max von Sydow*; directed by the late, great Sydney Pollack. Got it queued up for watching here in hi-def this evening.
And, if you want to truly ghost a pipe -- smoke this stuff in any number of pipes for three days.
* Just finished re-re-re-watching Woody Allen's Hannah and Her Sisters (1986): Max is great!