Smoking tobacco not only harms the smoker, but other people around that smoker via passive smoking. This can then lead to major illnesses such as asthma attacks or cancer. If a person died from cancer caused by passive smoking, that is a form of euthanasia. This could also harm children, which could have damaging effects which they would have to live with for the rest of the life, and it could even shorten their life.
An outright ban on tobacco would be unwise as it would most likely result in illegal cigarette smuggling through neighboring countries which would benefit organized crime and distract law enforcement from more important tasks. Although the smoking of tobacco would probably decrease significantly, there is always the possibility that smokers would turn to more dangerous or addictive substitutes.
There's an ugly movement is liberalism to promote health consciousness by getting rid of unhealthy things, despite the idea that America is built on the foundation that we the people should be free to do whatever we want. If we're pushing to legalize marijuana, as well we should be, why should we crack down on nicotine? Promote the knowledge that smoking tobacco causes risks, but don't make anything illegal unless it can be used to harm others.
As we learned during the 1920s when we attempted to ban alcohol in the United States, and as we appear incapable of accepting in modern times with marijuana, prohibition simply does not work. We are doing what we can to make the use of tobacco socially unacceptable through outlawing public smoking and through public health campaigns, and that is working. But a ban would not.
Smoking tobacco should not be illegal. Tobacco has been around for centuries and is a natural growing crop that farmers make their living off growing. The amount of taxes that are generated from tobacco is a lot and is used by every state in America. If we ban tobacco then that revenue is lost and the economy would suffer even more.
I do not believe smoking tobacco should be illegal. Prohibition has shown to be a major failure, regardless of what is being banned. Prohibition simply creates more criminals, it doesn't solve the problem, nor does it remove the product from the market. Therefore, people will continue to smoke tobacco rather it is legal or illegal.
Adults should be permitted to make adult decisions. This includes the right to ingest anything that an adult wants to ingest, including smoking tobacco. Making smoking illegal is an overly paternalistic an immoral restriction on a persons natural rights. Tobacco smoking should not be banned or made illegal in any way.
People have to understand that prohibition of popular and widely used substances does not work - if you're reading this and don't understand that, please try to. Prohibition of cigarettes would be dumb and impossible to enforce, even more impractical and ill conceived than prohibition of alcohol was a hundred years ago.