I use to have a pastor who said when the Spirit begins to move, you could smell what he called "a sweet smelling savor", He based this on
Isa. 20:41 or something like that. I would think, though, that this passage was speaking figurativley, rather than literally.
But, it was true. Sometimes we could smell a sweet aroma in the services. When the wind blew just right, and a window was open, we could smell the honeysuckle behind the church. He was convinced, however, and convinced others, that this was the "sweetsmelling savor" of the Holy Ghost.