user: Question: How many people were in attendance when the visiting team was the Nuggets and the leading scorer was J.R. Smith (28)?
Columns: ['Date', 'Visitor', 'Score', 'Home', 'Leading scorer', 'Attendance', 'Record']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['2 February 2008', 'Bobcats', '101–117', 'Nuggets', 'Carmelo Anthony (25)', 19391.0, '28–18']
SQL:

assistant: SELECT "Attendance" FROM "Table" WHERE "Visitor" = 'Nuggets' AND "Leading scorer" = 'J.R. Smith (28)';