Depending on the NPK of the miracle-gro that you use, it very well could increase yields in a hydroponic or potted cannibis operation. You may want to look into drip irrigation if you have a large scale outdoor operation, miracle-gro could help you in this situation also. Drip irrigation coupled with miracle-gro injection into the drip line could most definately increase yields in your operation.
Why do I get the feeling you were somehow pondering the idea of turning water soluble plant food into meth-amphetamine. Hmmm.... in that case you may want to search somewhere else for the Raid and Vicks methods of methamphetamine synthesis.
I am just kidding, use the search engine, and you will learn many ways to synth your desired end product..
regards,
m_e