Jung shared Freud's predilection for slips of the tongue, even though they disagreed on other things. I'm a fan of Jung moreso, personally.
I believe it would vary with the person and context. Even if it's something happening below conscious thought - the panic answer of "oh no cigars are phallic" seems too simple a hangup. Previous conversations about cigars/smoking, if they view cigars as a sign of class, maybe they kicked an addiction but favored cigars... Psychoanalysis just seems so personal (and case-by-case) to me.
Am also disinclined to believe that all verbal/nonverbals are significant. That's just my inner math nerd talking, though
Good article!