How does one use the DXM thus extracted?
The DXM you extracted is in free base form, so it is theoretically possible to smoke it using a vaporization pipe. I don’t know of anyone who has done this, and I can’t make any claim as to its safety (for all I know, it could eat your lungs out; I doubt it but it could). You can also load it into a capsule and take the capsule. I would advise eating with this to avoid stomach pain (probably due to the alkalinity of the DXM). Or, you can neutralize with dilute HCl and drink the resulting liquid (which, from what I hear, is pretty yucky).