I have seen this debate before and I have found through my research that there are many pros and cons to many solvents.

For example 190 Everclear has 5% water in it, which can extract the red oil from the plant material. If you are using chemical fertilizers, you will also be extracting that which in turn will end up in the finished product due to the fact that the fertilizers are water soluble, where the THC and other elements are oil soluble.

I stick with the fact that the quality of the cannabis and the quality of the method of converting into the oil, everything else is secondary. Also, all the people I have seen debate on many, many posts and sites, not once have I seen one of the people try both ways and do a quality comparison. In the future I myself would like to compare iso with 190 everclear. I forewarn, anything less than 190 everclear, it is a wast of money and time, in my opinion.

I have also read that comparing the toxins in the liquor or iso that the liquor carries half the toxins as the iso, so if I am not mistaken, it is probable that the remains of the liquor after processing the oil may also carry a percentage of carcinogens similar to the iso.

I agree, it is worthy to try. Thus far I have no reason to believe that the iso is more dangerous.

Now if he is talking grain alcohol like "moonshine", I have read that it cannot be used, that it is far more dangerous in many ways, I just can't remember the details.