If a true consensus revolving around societal harm vs benefit is reached then that's the consensus and you've got to respect it. If a utopian society could ever be realized it wouldn't be a problem. Many people use nicotine to self medicate for anxiety, my guess is there is a very specific brain chemistry that makes nicotine's moa the most effective therapy available to some people. What we should be focused on is developing a therapy for people who suffer this type of particular brain chemistry that doesn't involve something as harmful as tobacco use.