My first order from ECBlends was back in April when I was just starting out trying 5ml sizes from lots of vendors. I ordered 100% VG, 12 mg nic strength, some with extra flavor, add sweetener some not. I liked a lot of them but there was no TH and the flavors were very muted, due to the VG I suppose. After letting them steep a few weeks, nothing changed much. My next order was for 18 mg nic strength, still all were 100% VG some from the organic line etc. I order LARGE bottles in the Zebra which I particularly liked from the first order

HOWEVER, much to my confusion and dismay, these were all totally different (I'll describe it as thick and very dark looking liquids, not at all like they were in the 5ml 12 mg nic bottles.) So, by ordering a higher nic strength, they were suddenly thick and very dark? None of them tasted right, kind of nasty, bitter smell, much like when I took a whiff of 1000 mg nic that I've ordered from another vendor

I let these steep for a few weeks before vaping them again, hoping that they would be less harsh smelling. Long story short, when I went back to them they were all even thicker like tar and the awful nic smell was overpowering and I ended up trashing them all

without even attempting to vape them.
I didn't bother contacting the vendor because most vendors all have disclaimers about eliquids blah blah blah. I chalked it up to an expensive lesson learned. Perhaps it was a fluke and might never happen again, but I don't want to chance it LOL
None of my other vendor juices at 18 or 24mg nic have turned to tar (for lack of a better description) even after having them for 6 months or longer in some cases. (Except for that 1000 mg nic juice that I had ordered from another vendor, which was so dark and thick from the git-go, became even darker and nasty vomit smelling... even after diluting down to 10 mg with plain vg...the thick vomit smell was too overpowering for me to even attempt to vape it, but that's a whole other story LOL) Sorry to digress
