What are the health effects of smoking hemp oil (not cannabis)?

Hard to say: There have been a number of recent reviews of potential effects from the higher levels of cannabidiol (not THC) in hemp oils, and how they might have anti-tumor effects, anti-convulsant effects particularly in some refractory childhood forms of epilepsy, as well as effects for treatment of neuropathic pain and muscle spasm. However as with THC there is uncertainty in dosing, purity, other issues.