Help! Edibles don't work for me

Well, the title pretty much says it all. I've tried edibles several times, some homemade, some from a local dispensary. I've been a regular user of cannabis for around two years, and am by no means "doing it wrong" (wait how could you even?), regardless every time I eat cannabis I have no effects what-so-ever. Has anyone else experienced this? Anyone know why this could be happening? I'm at a loss. Cheers!