Didn't say it was determined by, but it does tell us what most the science says. There really are not as many questions as you seem to think there are. You simply choose to believe there are that many questions.Again, science is not determined by 'consensus'. The fact is that there are just too many questions being raised about the science involved..
You might recall in reality it was only those who worked for the tobacco companies who said it was not deterimental to your health. Largely, the consensus said otherwise, that it was unhealthy for you. Tobacco companies successfully convinced the public there was a debate where there really wasn't one, just oil companies are doing now.That's an excellent example! Do you remember the number of doctors and scientists saying that smoking was not detrimental to health, that it was relaxing, that it soothed your throat? Follow the money.