I just got a package of supposed dmt freebase, but I thought it was white. . . it looks like brown sugar instead. .. should I go ahead and smoke it?

No!

This is a perfect example why you should extract your own... Pure DMT is white/transparent, and it's not hard to have it purified to that point. Which means whatever you have, it should not be trusted. Who knows with what solvents/chemicals it was extracted with, what possible toxic rests can be there.

https://www.dmt-nexus.me...aspx?g=posts&t=11715

Also, please don't talk about 'getting packages' of controlled substances.

https://wiki.dmt-nexus.m...ng_or_smuggling_of_drugs