ABSTRACT The present study was conducted in Ekpoma, headquarters of Esan West Local Government area of Edo state. The aim of the study was to determine the effect of marijuana on the heart of wistar rats. The study involved twenty four growing wistar rats having weights between 250g-275g divided into 4 groups; control and groups 1-3, comprising of 6 rats each. The control group received only grower’s mash and distilled water while groups 1, 2 and 3 received 0.02mg/kg body weight, 0.04mg/...