Question

identifying variables in a hypothesis
identify the variables in this hypothesis.
if a persons use of cigarettes increases, then the persons lung function will decrease because the chemicals in cigarettes damage lung tissue and make it difficult to breathe.
the independent variable is
the dependent variable is
lung tissue
cigarette use
lung function

Explanation:

An independent variable is the factor that is changed or manipulated. Here, cigarette use can be increased or decreased. A dependent variable is the factor that is being measured and is affected by the independent variable. Lung function is measured and changes depending on cigarette use.

Answer:

The independent variable is cigarette use.
The dependent variable is lung function.