Sounds like you ARE a medical professional Mark!
I get that oil would effectively block up the lungs but I don't see how it could be worse than smoking. What do you think? (Any medical experts can shed extra light on this topic)
Also if ALL CCW lemon-containing flavours have oil in does this mean that ALL flavour companies use oil in lemon flavourings? I can't believe that companies like Flavor Art and Liquid Barn that specialise in the vape market would use oils if they weren't considered 'healthy'.