Volume Very Dark Brown Hair

Only thing I do is smoke weed every week or other week. I eat much better than most, almost all organic. I use organic natural hair shampoo and conditioner. My hair has a very nice volume to it. My hair very very dark brown, seeming almost black. I have never used heat treatment on it, to curl or straighten. I have never used hair dye or anything. My mother is Ukrainian and Father is Peruvian.