I have been. They're always not going to be honest though lol they want to make money
		
		
	 
Then, it's up to personal choice & personal responsibility. It is your choice to find away to verify trust of a vendor, attain products without the risky ingredients, if you choose avoiding them. It is also your choice to use what you desire regardless of verified trust. I 
think vendors & manufactures of juice 
ought to be required to honestly label their product, allowing the consumer an 
informed choice. Now, with the FDA regulations 
likely to create a black market, that 
seems a pipe dream at best.
Recently tried using unflavored 50%PG/50%VG nicotine base juice myself. I could actually enjoy that if I chose. I still get the nicotine I desire/need. The 
unflavored aspect may fool you, there is still a natural sweetness to VG. I may soon in fact be using only unflavored juice base. I 
may or may not choose to later attain flavorings I can verify trust in, to add to the base if I choose at some point.
By the by, 50%PG/50%VG is actually 41%PG/41%VG using 1.8mg/mL/18% nicotine. I sat and figured that out after looking at a vendor's sales site and the whole ratio of the maths involved. It is basic 10 based metric, and a little less difficult 
for me to comprehend than I 
imagined. 
Remember, 1 Liter is 1,000 mL and it takes 10 one hundreds to make 1,000 and there are 10 ten mL bottles in 100 mL to make 1 Liter. That pointed to me the 10 base system. 
To me this 
seems to work very well, very logically, very simply and it is helpful for my lacking maths skills.