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The finish on your pipe probably was destroyed by the vinegar, and as some one else said, could possibly be restored with fine sandpaper.
I've been making some nice gift pipes out of soapstone for over 20 years and highly reccomend them to anyone who wants to keep it all natural.
No off gassing, impervious to most chemicals and will never wear out.
I use vinegar to clean the scale(calcium/lime/etc) deposits off my humidifier and it eats that stuff up quick. I'd say it dissolved the outer layer of the stone, next time try rubbing alcohol or pipe/bong cleaner. Even just pouring a little water in there with some coarse kosher salt and shaking it around will help clean it safely...