Hi fcers, Disposable cartridges are all the rage here in California, and I'm loving them. One thing that concerns me is the safety of them. Many use silica wicking and others use ceramic. Most of the ceramic ones are using ccell technology. Ccell is silica ceramic, not alumina ceramic like used in dt products. Does anyone know the safety of these products or have an informed opinion? What are the safest tank type atomizers readily available?