Question: when was the first e-cigarette sold in the us
[{'answer': '2007', 'provenance': [{'wikipedia_id': '11996885', 'title': 'Electronic cigarette', 'start_paragraph_id': 68, 'start_character': 403, 'end_paragraph_id': 68, 'end_character': 407, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '11996885', 'title': 'Electronic cigarette', 'start_paragraph_id': 68, 'start_character': 103, 'end_paragraph_id': 68, 'end_character': 1052, 'bleu_score': 0.82048766049803, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10048341157749412756}, 'section': 'Section::::History.\n'}]}]