New to the forums, here, not with the psychs. Just wanna throw my 2c on what's being discussed.
For me, 2c-b has a very diminished and somewhat uncomfortable effect on the 3rd day in a row. First two work like a charm, but third is just off. Never tried to push it past that. I belong to that minority group that develop tolerance to it fast.
It's a fantastic substance. However, it seems to induce HPPD more likely than most psychs. Same goes for other 2c-x in general. I for once got VSS/floaters/tinnitus from a 2c-b binge (90mg snorted throughout the day). Continued to use bunch of substances since, also tried to make longer breaks, but it never diminished or improved, which is strange.
So beware of that risk. Although it seems quite safe physically, it can mess up some neurochemical stuff - probably related to glutamate.