Smoking is prohibited in the following outdoor areas of public places, except as otherwise restricted in accordance with the provisions below:
1. Outdoor dining areas of restaurants with no roof or other ceiling enclosure; provided, however, that smoking may be permitted in a contiguous outdoor area designated for smoking so long as such area: (i) constitutes no more than twenty-five percent of the outdoor seating capacity of such restaurant; (ii) is at least three feet away from the outdoor area of such restaurant not designated for smoking; and (iii) is clearly designated with written signage as a smoking area.
Above info is from page 12 at nyc.gov here.
2002 NYC Smoke-Free Air Act (SFAA) § 17-501 NYC; “Smoke-Free Air Act.”17-503, C