I just had an eight hour journey that was light and beautiful, I'm ready to redose But before I do I was wondering if I have to double up??? as is the case with most other psychedelics. Any input would be greatly appreciated...

Nahh, there shouldn't be any tolerance issues with dmt and harmalas so you should be good. Any doubling up will most likely shoot you farther than you intended to be. If it doesn't hit you quite as hard as you'd like, just smoke a little bit of changa (if you need more harmalas) or spice (if you just need more light) and that should get you there.

Good luck

thanks MelCat!!!!!!!!!! For clarifying that issue