Those are electronic cigarettes which use an atomizer (heating coil) that vaporizes flavor either natural or artificial with either vegetable glycerin or propylene glycol to create a vapor.
Some have nicotine and some don't. It just depends on your preference.
I vape using 11mg pharmaceutical grade nicotine with a virginia flavoring.
Wether it is pharma grade or from china, they all come from fertilizer manufacturers.
If u want a e-juice that is ONLY from organic tobacco, this place sells it.