The act of nasal inhalation, or sniffing, is a powerful modulator that increases brain alertness and enhances the sensitivity of the olfactory system.

“it turns out that simply sniffing nothing. So, doing something like this. [Andrew sniffs deeply] I guess the microphone sort of has a smell [sniffs], I guess my pen doesn't have a smell. [Andrew sniffs deeply] It turns out that doing a series of inhales, and of course each one is followed by an exha”