User blog comment:Vulture345/Is Leni really Mentally Retarded?/@comment-31323774-20170812021128

Although the smoking theory is a possibility, I believe that isn't the case. Honestly, we all have our dumb moments in real life, and I believe Leni just hasn't learned how to control it. When we have a dumb moment, we typically retract from it, but Leni seems to not. This is possibly because she just hasn't adapted controlling it. Maybe something else could've happened. She could've had some sort of head injury to name a few. Maybe she didn't get lots of knoledge in school for some reason, probably causing her to only know 40 states and having difficulty after the letter P. I believe we'll get some sort of backround of her stupidity in a future episode.