Adolescent‐onset heavy cannabis use associated with significantly reduced glial but not neuronal markers and glutamate levels in the hippocampus Grace Blest‐Hopley | Aisling O'Neill | Robin Wilson | Vincent Giampietro | David Lythgoe | Alice Egerton | Sagnik Bhattacharyya Addiction Biology, 2019, e12827, 1-11. DOI: 10.1111/adb.12827   Abstract Cannabis use has been associated with adverse mental health outcomes, the neurochemical underpinnings of which are poorly understood. Although preclinical evidence suggests glutamatergic dysfunction following cannabis exposure in several brain regions including the hippocampus, evidence from human studies have been inconsistent. We investigated the effect of persistent cannabis use on the brain levels of N‐acetyl aspartate (NAA) and myo-inositol, [...]