I too, tried the whole college thing. My first year I lived with two people I didn't know. I told them I had CF and explained what it was, what I needed to do for it, showed them my nebs, etc. I had no problem doing them in front of my roommates or other people, I even ran IV's my freshman year, stocking up the mini-fridge.
there were three times however, that when doing pulmozyme and tobi right in a row, that I set off my fire alarm/smoke detector! That was a little embarrassing, seeing as it only set off my individual one and MY RA wasn't on, so took a lot of explanation to the current RA. After that happened I talked to my RA about having a separate room 2x day without a smoke detector, they came up with some ideas, but I never really used them b/c I wasn't very compliant.
College life really wasn't the best fit for me, so I transfered out of the University and ended up doing an online program which I love. So that might be a helpful tool in your toolbelt... because sometimes college just isn't the right fit for us (I know it wasn't for me!) so online universities offer much more privacy and independence. I personally love it, and I wish I had thought of it earlier. Plus it is a lot cheaper, and is self paced. So reassuring him with other, alternative options is always a good thing, because I know I felt pressured to stay in school for health insurance reasons -- so If dorm life doesn't work out, or the whole university thing, there's surely a back up out there for him!!
I wish him the best of luck!!