Your Kush Smell comes from strains that are from here...http://www.baluch-rugs.com/History/Hindu_Kush_Mountains.htm or have been crossed with strains from there. If your Weed does not have anything with said below, then its not a kush strain.
Kush refers to a subset of strains of Cannabis...
I am having great results using Canna Coco A + B and Cannazym in 100 % Canna Coco. Ph at 5.8 to 6.0. The Cannazym is good for dead root material, so you can reuse your Coco 3 times according to canna. See their Video Here http://www.youtube.com/watch?v=KsJXJED0qD4