After some tedious experiments in the late 20th century, scientists have shown evidence that the chemicals and materials found in the cigarette can cause diseases in the long term. In the 1940s and later years, there were increased cases of lung diseases and lung cancer, where it was supposedly a very rare disease.
They changed society's view of smoking after 1960 by showing that smoking causes cancer.
[Clarification Statement: Emphasis is on qualitative molecular-level models of solids, liquids, and gases to show that adding or removing thermal energy increases or decreases kinetic energy of the particles until a change of state occurs. Examples of models could include drawing and diagrams. Examples of particles could include molecules or inert atoms. Examples of pure substances could include water, carbon dioxide, and helium.]
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Or <span>The average density of the boat, including the steel and air, is less dense than 1.00 g/cm³..</span>