Not that I disagree, but the nice thing about purchasing flavors from a vape vendors is they don't sell flavors in a base that would be dangerous to vape. And maybe we should mention this more.
Sure, some vape vendors sell alcohol based flavors. This isn't dangerous AFAIK, just very harsh to vape. But once you DIY your e-juice, you just shake and vent it for a few hours and the alcohol evaporates.
But some of the flavor bases you will find at a non-vape vendor can also be oil based. This coating your lungs can suffocate you I am told. And the hospital can do nothing for you except watch you die.