During the late 1970s, a controversial program sponsored by the US government sprayed paraquat on marijuana fields in Mexico.Since much of this marijuana was subsequently smoked by Americans, the US government's "Paraquat Pot" program stirred much debate. Perhaps in an attempt to deter people from using marijuana, representatives of the program warned that spraying rendered the crop unsafe to smoke
California study states Speed (Amphetamines) affect the release and uptake of dopamine, the key neurotransmitter involved in Parkinson's disease.