Question: when was smoking banned in restaurants in michigan
[{'answer': 'May 1 , 2010'}, {'provenance': [{'wikipedia_id': '5718985', 'title': 'List of smoking bans in the United States', 'start_paragraph_id': 316, 'start_character': 0, 'end_paragraph_id': 316, 'end_character': 674, 'bleu_score': 0.7419160220013281, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6244672353742137423}, 'section': 'Section::::Smoking laws of the United States by state or territory.:Michigan.\n'}]}]