Modern Hippie Candles are 100% Safe! They're made with Therapeutic Grade Essential Oils, Eco-Soy Wax, cotton wicks and packaged in re-usable, glass canning jars with a metal lid. We never use artificial fragrances (harmful petro-chemicals), zinc-based wicks orĀ paraffin wax, which creates highly toxic benzene and toluene when burned (both are known carcinogens).