lol, aww, don’t feel discouraged. Sometimes, it takes time for your body to get used to pheros, even people you know may need to get used to it.
As for the grocery shopping, it’s not really the best place to test pheros, specially the cashier, lol, the poor guy might have been working fast so the next person in line wont yell at him to stop chattin up with a hottie lol
Plus, I recommend you to wear instant openness or instant shine with is/a so people would feel more “open” to you. Instant sexiness A is a strong, alpha woman yet incredibly sexy, it’s like representing angelina jolie, and guys just don’t want to mess around with you lol. So you could “soften” it up with a social phero.
Start with lower dosages first and work your way up. I don’t know how old you are (which makes a huge difference when using products that contain cops). The older you are the more you need (sorry if I phrased this wrong, english is not my first language lol). But hey it doesn’t hurt to start small and then build up 
Plus, like what others have mentioned is really true. I post reports when my hits are blatant or out of the norm and they don’t happen every day lol. Sometimes I get nothing at all either, but hey, it worked quite marvelous yesterday lol, so you never know. It depends on people’s noses’ lmao, some will smell the phero fumes real fast and BAM you’ve got a hit (stares/approaches/touches), while other people might not have “smelled” it well lol. I’m no scientist, but that’s just my little hypothesis though 
But yep, don’t give up on them yet, it’ll take time, hold on sweetie, and keep those reports coming so we can help you out 
hope it helps and good luck!