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While I get your point, I don't necessarily feel it all needs to be "smooth"; an entire piece need not feel like it's all immediate family. I think, the idea you're asking about isn't necessarily "smoothness", but a sense of connection between sections; natural, organic evolution of a piece. Don't be afraid to stay with a single idea longer than you feel it should. If you've already abandoned something by the 16th measure, you're moving way too fast! Let things sit and simmer...eventually, the music will tell you where it wants to go next. This will come easier as experience grows... That said, don't feel you need to prepare listeners for everything. Unexpected twists and sudden shifts can make for very engaging and creative music.

That's the thing....it doesn't. It's all about your environment.