There are a number of "grandfathered" products that are known to be toxic and are used in manufacturing many of today's common everday consumer products. Propylene Glycol, Sodium Lauryl Sulfate, Polyethylene Glycol, Parabens, Mineral Oils & Glycerin, Flouride..
Just to name a handful.. Read the ingredients on your every day products.. expecially soaps, detergeants, and skin care products!
You will easily find many of these named chemicals..
Why would RFMK be any different... They don't have the resources, and or the wherewithal, to manufacture top quality toxin free vapes. I spent a good chunk of time reading up on what it takes to manufacture "The Best" vapes on the market.. RFMK has a long way to go to make a product that will be widely accepted in the Vape Market. All JMO of course.