Looks like a crap article in a crap journal. In the abstract they refer to cannabis as a stimulant, which seems quite incorrect. Also the results are unsurprising and not very exciting.
> The levels of G-6-PDH were increased in the brain tissues of all the treated animals (Fig. (Fig.5).5). Caffeine produced quite more significant effects relative to cannabis and the combination of both increased the level of G-6-PDH greatly.