Asheville bookseller Linnea Kowalczyk, 41, reports a 340 percent year-over-year increase in sales of titles she “is not technically allowed to recommend out loud anymore,” following the passage of a state law restricting in-store promotion of certain works. Kowalczyk, owner of Margin Notes Books on Lexington Avenue, has begun communicating with customers via a system of meaningful eyebrow raises and a small chalkboard reading “ASK ME ABOUT THE WEATHER.” “Business has never been better,” said Kowalczyk, “which I would call a silver lining if the cloud weren’t, you know, the cloud.”