I'm not so sure. I started (technically) with C++ and Java in miscellaneous summer camps and an independent-study highschool class, but my first serious course in a language (instead of just toy problems + messing around) was in Racket... I got the hang of it during the class, but I couldn't hold onto it the way C-family syntax just stuck, and when I last tried to pick up something Lisp-family a few months ago (Common Lisp) it was like I'd never seen Racket.

Unless that actually is "ingrained habits," I suppose, but in that case I had the habits before I ever hit college or knew that other syntaxes existed.