Question: 20 reasons why smoking is bad?
Answer: Lung Cancer. Smoking is the number one cause of lung cancer. ... 
Heart Disease. One out of every five heart disease deaths is directly related to smoking. ... 
Diabetes. Smoking causes type 2 diabetes. ... 
Liver Cancer. ... 
Erectile Dysfunction. ... 
Ectopic Pregnancy. ... 
Vision Loss. ... 
Tuberculosis.