The answer is:
Age
This is because if your young your organs are not as developed. When your older your body handles more because it is developed fully.
I believe it could be true? ...... hope this helped
Smoking or drug addiction for an expecting mother is more dangerous because not only are the chemicals affecting her but they are affecting her baby as well if addiction continues through to the birth of the child the baby can experience withdrawal symptoms and can be underdeveloped
Answer: Connective Tissue
Hope that helps!! :)