I don't recommend using any psychedelic every day. Some, like AMT, I have done this with and ended up in a bad place similar to MDMA abuse. With 5-MeO-MiPT, whenever I take it too often (even two days ina row), all the times after the first just feel like a light stimulation with none of that magic. Basically, it's useless to try to push it too far. All psychedelics build tolerance very quickly so it's not a good idea to use them multiple days in a row, but some build tolerance more quickly than others, it seems, and 5-MeO-MiPT seems to build tolerance to itself very rapidly.
When I've overused 5-MeO-MiPT, I do not seem to get any serious negative lasting effects, just the inability to have a good trip on it. However, I have in general way overused psychedelics, particularly in 2006-2007. I tripped multiple times per week that whole period of time, and the result is that it's hard for me to have good trips even now when I no longer do that... even after 4.5 months off at the beginning of 2008. It's called "loss of magic" and it can happen, and what causes it is tripping too often with too little of a break between times.
Better to save it for special occasions. I know it's tempting to use them more often since they're so much fun and such great substances with few physical side-effects (for many anyway), but it's not good to overuse them. Really, it's not good to use any drug every day (even weed as you mentioned), but some drugs will give you pretty much the same effects every day and continue to work. Not so with psychedelics. There's only so much you can take, and you don't want to reach that point.