Are illegal black market oils and vaping materials, really to blame for the wave of recent deaths?

According to My Stateline the last few months, the vaping industry has been met with a lot of serious issues. Vaping deaths, no one wants to see that. But the vaping industry is firing back, blaming illegal "black market" products not the real stuff:

“Oil should not be going into our bodies and what it’s doing is turning tissues and substances into fatty tissues in your lungs and filling your lungs up and basically the end result is death,” - Jeff Kathman, board member with the Ohio Vapor Trade Association

The vaping industry is trying to get government to stop blaming them for the vaping deaths. They say that the vaping industry has been around a long time and with the recent wave of deaths, it has to be because of illegal black market products.