Should You Use Slang In A Novel?

In my formative years everything was lush. This was not a description of my environment, although the word would have summed up the fertile, green hills of Devon quite well. Lush was how my contemporaries and I described anything that pleased our senses. Granted we were a tad indiscriminate with the word, bandying it about for everything from a nice pair of boots to a night out, but hey, such is the world of a provincial teenager.