How can refraining from smoking benefit an individual's health?
a.
refraining from smoking reduces an individual's risk of contracting most types of diseases.
b.
refraining from smoking eliminates the risk of developing cardiovascular diseases.
c.
refraining from smoking eliminates the risk of developing respiratory conditions, such as asthma.
d.
refraining from smoking reduces an individual's risk of contracting certain types of diseases.

The correct answer is option D.  

Explanation:

Smoking cause harms to the human body in almost every organ but some do not show immediate negative effect and develop a serious condition of a certain type of diseases such as the lungs related problems like emphysema, lung, cilia or other respiratory infection or scarred lungs.

The other negative effects are the heart-related condition that arise as it increases blood pressure and stresses your heart which in the long term makes your heart weaken and develop a serious heart condition. smoking can cause some other condition like hormone imbalance that can lead to several pathological conditions. The most serious case is cancer which is most likely to appear in smoking people and some times in COPD too.

Thus, the correct answer is option D.

proteins is the answer