It can be the example of all kinds of sickness
Since smokers are not allowed to smoke within restaurants, office buildings, airports, schools, and many other places, far fewer people are being exposed to secondhand smoke. People with asthma and allergies to cigarette smoke are now able to breathe more easily as well. Children are no longer being exposed to secondhand smoke in spaces outside of their homes.
Human behavior which can be seen by other people and observed by other people is usually also the behavior which is often subject to measurement, control, and experimentation in psychological experiments. The field which does this is psychology.
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The President in the executive branch can veto a law, but the legislative branch can override that veto with enough votes. The judicial branch interprets laws, but the President nominates Supreme Court justices, court of appeals judges, and district court judges who make the evaluations.
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