I cannot test this but I can only imagine that the activated carbon would catch a good bit of the DMT vapors. This stuff REALLY likes to condense.
As a user of ta VG Glass bat vaporizer, I notice that a lot of vapors condense on the inside of the glass and once a little bit starts to condense, a lot more condenses on it to the point of forming crystals when it cools.
On that note, have you looked into any of the Vapor Genie products? I absolutely love my glass bat one both for fluffy x-tals and changa and am considering adding the Sherlock GVG to my collection as well seeing how many people swear by it. Took a little bit of getting used to for which I used air dried mint to learn it. For learning the tool I simply loaded it with mint, took a few hits til depleted of minty-ness, and reloaded until I could deplete it in 1-2 hits consistently. Now, I can consistently load up a moderate to heavy dose of my favorite mix and deplete it in 2 hits if I go for it. All with no combustion by-products. Not saying it is as healthy as air, but a lot better than smoke for sure.