I used to think that I couldn't get high from edibles too, and then I realized that I just need 100x the dose. Most edibles have about 10mg of THC in them, so as a daily smoker/vaper I never got anything out of them either. And then I tried a 1000mg chocolate bar from the dispensary and I definitely felt that. I got a nice four hour high out of that one.
The other thing is that the effects of edibles are a lot more subtle. When smoked/vaped, it hits you all at once, but with edibles it gradually builds up then slowly fades away. You often don't even realize you're stoned until you stop to look at your eyes in the mirror. And then you notice that you've been in a good mood for the past hour or so...then suddenly it dawns on you that you're high as fuck. It's that sneaky.
edit: Math is hard