OK. It looked like you were making a connection between the two actions. FWIW I can’t find where you pinged me to this article anywhere on my comments page.
Adding Color Untangles the Brain’s Gray Secrets
I linked you to it with a post/comment on that thread. On second thought, smoking is enough of a problem that I'll post that last link, which goes directly to a printer friendly page.
P.S. If you like the colored neurons in those pics, there are more in the supplemental information pdf.