i IV'd 2CB, the first psych ever to be and my first revisit to the needle several months ago during a very depressed period. I thought it might scratch the itch yet kill any desire to continue. And boy, did it, at first. Something about seeing a vein in my hand swell up to the size of at least a jawbreaker when I knew I was in.. (It also provided much more mescaline-like effects than any of my extensive experiences with said chem, and lasted about 4hrs of pretty heavy visuals. It looked to be around 10-15mg, same amount i'd snort or plug.
Then before fully getting over the aforementioned bummer, for lack of better terms, something else bad happened which led to a missed coke shot and staph, plenty of stim shots with a flubLam back, and plenty of good soft or hard going directly into my bloodstream.
As for the addictiveness factor of IV, I haven't in several days and am going to check if that max solubility IPPH solution has changed at all after 4-5 days, or if its long-been beyond maxed out. I have aclean dart thankfully. I ate surely at least 0.3g propylhexadrine recently so I might be way too high. very soon.. but.. that's IV in a nutshell.