Shake and vape is real, but it’s not a magic trick, RioMist.

Some flavors are bold enough to strut straight out of the bottle, others need time to put their hooves up and settle in.
Fruits, candies, mints → usually fine right away. They might sharpen or blend a little with a couple days, but you should taste something from the start.
Creams, custards, bakeries, tobaccos → forget it. Those stubborn goats need a week or three to stop kicking and start playing nice.
If everything you try right after mixing tastes like nothing, don’t panic — it doesn’t mean you mixed wrong. It just means your concentrates are the “slow cooker” type, not the “microwave snack” kind. Give them a week, then try again.
My advice:
Always test your mixes fresh and again after a week (and sometimes after a month if it’s heavy custards).
Keep notes on how they change — that’s how you’ll start to see the pattern with each flavor.
If you want instant gratification, stick to fruit-heavy recipes at first.
DIY isn’t about speed, it’s about control. Shake and vape is a thing, but it’s not the whole pasture. Patience is just part of the herd life.