Well, I find it depends on a few things: strain smoked(indica? sativa? blend? or even, hash?), how much/method smoked(did I vape one hit, or did I take a whole bong in a short period of time?), and how much I have smoked recently(been a couple days? been a couple hours?). I go into work high regularly--but I'm only talking like "couple hits off the shooter" high--, and because of it, they're more likely to think somethings up when I'm not stoned. I'm lucky in that my eyes don't get red as easily as some peoples, but the difficulty is in trying to not squint a whole lot haha. I also talk a lot more, or more enthusiastically in general, when I'm stoned.