If you ordered online check your onsite invoice and if you did correctly order 18mg, they will usually just send you out the correct strength and tell you to keep the one you have.
I should have been clearer in my OP, apologies.
I mix my own juice of 18mg strength from base.
This little bottle was bought(bricks and mortar) as little cheer up gift for someone else, a separate thing entirely.
Didn't notice the '0.' part until I got home, I thought it was just 3.
Have never seen juice in that strength range before and wondered if it was something I had missed before in terms of denotation.
Alas it is done now and the container opened.
I have plenty of nic base if I want to raise the strength but the person does use lower strengths and wishes to continue decreasing, so we'll see how it goes.
Hiho, we live and learn.
Thanks for the advice Letitia.