The First Amendment.
Laws generally prohibit things, rather than declaring them legal. There is no law that states it is OK to drink water. It is a privilege that is assumed until there is a reason to legislate otherwise. The same is true of smoking.
It is still legal to smoke tobacco, although not in all locations. Obama has introduced no new law to ban smoking.
yes smoking is a law
Ex Post Facto Law
This is not a sentence.
This question makes no sense.
It Hurts Your Lungs And You Might Get Sick Or Even Die So Its Against The Law To Not Smoke.
It is called an "ex post facto" law.
Yes, you can get diseases by smoking legal drugs.
A Government can pass a law that makes a legal something into something that is illegal. One instance is the anti-smoking law passed by the British Government - it is now illegal to smoke in a public house, on a bus, and in many other places.
18 is the legal age to smoke cigarettes. However if you do it in a private place the law cannot do anything as you are not in public
Australia did change the legal age for smoking in 2009.