It is known that, developmental processes correlate with disease trajectory based on biological, psychological, and social characteristics of individuals. COPD and depression can be linked to biological, social and emotional elements over the lifespan. Furthermore, the results of biological and environmental stressors show interindividual consequences. In other words, individuals respond differently to disease precursors. Subsequently, two examples illustrate how childhood characteristics correlate with COPD and depression latter in life. Adolescent depression. An example of behavioral and biological processes influencing one another in a circular pattern involves adolescent smoking and depression. That is, adolescent depression increases
