ive found that if the concentrate has no smell then the ejuice you make with it will have no flavor when vaped, no matter how long you steep it
if you taste the concentrate straight from the bottle it will taste like what its meant to be
and if you taste the ejuice you made with it (drip a bit on ya finger and lick), it will taste like it
but from my experience odorless concontrate equals flavorless vape
i believe there are dogy concentrates around, a vendor could test this
pick 20 concentrates all same brand and flavor
can be from different orders
now sniff them all
how many have an odor and how many dont