What is wellness and its concept ?

the state of being in good health, especially as an actively pursued goal.

Explanation:

Wellness is an active process of becoming aware of and making choices toward a healthy and fulfilling life. Wellness is more than being free from illness, it is a dynamic process of change and growth. "...a state of complete physical, mental, and social well-being, and not merely the absence of disease or infirmity."

it's 150 100% postive

exposure to hazardous carcinogens and toxic substances can cause breathing problems, such as copd and various types of cancer. it also increases the risk of heart attacks and strokes and has serious (but no less unattractive) side effects, such as aging, yellow teeth, a terrible smell and damage to the vocal cords.