Vices that are best abandoned

NASTYHABITS

["Think of behaviors often discouraged for health or social reasons, like biting your nails or smoking—this phrase sums them up as a pair of words."]

The clue plays on the idea of "vices" as negative behaviors you’d be better off quitting. "Nasty habits" directly fits that meaning, but the answer is written as one word to match crossword style. The phrasing also hints at the word "habits" being part of the solution, since habits—especially bad ones—are often called "nasty" in everyday language. It’s a straightforward definition with a slight twist in how the words blend together.