It was 1933 when prohibition was outlawed. Prohibition had infringed several rights of sovereign individuals, including the rights to life, liberty and property. Including drinking alcohol. You cannot be considered free while you are forbidden to drink whatever you like. But, you can object, this is obvious.
Nobody supports prohibition, nowadays.
Well, that isn't true. And that is the case with smoking. Now, in reality, not all scientists accept this conclusion. Some others fight a battle not only for valid science, but also for the individual right to smoke. All over the world, governments are passing laws against smoking and creating agencies to enforce them.