One way in which creativity can be described is the ability to find new and novel connections between concepts. In scientific terms the ability to find connections between words is called semantic priming. A 2010 study published in Psychiatry Research found that the use of marijuana induces a state of hyper-priming. (9) When presented with an activation word, subjects reacted faster to distantly-related words when high than when sober. (For a neuroscience journalist’s take on this study go here.) The flow of loose associations promoted by marijuana is a real phenomenon.
Credit goes to Jason Silva for introducing me to this study. His article on marijuana’s “butterfly effect” on thought can be found here.