my guess is you'll be fine. funny thing, my first time i did 80mg snorted, kinda coincidence.
this is a big dose though, and at doses this size though i would expect start getting to see the bad side of ritalin though, like hands shaking and paranoia and a very elevated heart rate. i swear when i did 80mg my heart rate went over 160bpm. if you start to feel bad you might wanna down a xanax - that's what i did when i realized how high my heart rate was.