I never used Smalltalk directly, but it's (weirdly) related cousin, Objective-C. My first exposure to OO was reading the Byte Magazine edition about Smalltalk (the one with the Balloon on the cover) which led me to experiment with adding OO to plain C in the late 80's (I did not have access to C++ or Objective-C at that time).
Shortly thereafter, C++ arrived in the form of "cfront" which was a cross-language translator that would generate .c and .h files from .cxx and you'd compile those with a C compiler. There was no actual C++ compiler at first.
