Okay I started correcting your essay. Your introduction is a little bit confusing the way you have arrange some words. You just need to fix and take some unnecessary words. If you want to I can pm you some corrections to your essay.
Overall I do get what your saying is just some structure problems.
The cause of adolescent children
to begin smoking
Your first sentence is confusing. I made some changes.
Children who grow up watching their parents and other adults smoking have higher possibilities to smoke later in their life time.