Ricochet,
I had my tank running for 5 days in 100% VG. Mostly, vanilla. Flavor came out good, while it worked. My atty then got clogged and didn't worked anymore, no flavor, very little vapor. I cleaned it (water only) and waited for it to dry. Now it leaks like an open faucet. But looking at so many similar experiences with the tanks from other members, I'm not blaming it on the vanilla nor the VG.