Quote Originally Posted by Captain Hanks
that's very strange, i remember smoking some herb a while back that had a very strong "chemical" smell to it, the high from it was incredible, but it gave a slight headache after a few days use

That was exactly the case with my weed. It gave headache and strange pressure in your head, but the high was really incedible.
Now, I dried the herb, so this smell is almost gone, and I guess the chemical evaporized.