Answer:
Cigarettes should be banned because of a myriad of reasons: (If myriad is not something you would say then it means a buch, so you can say that too.) one, it could be deadly for you with concerns to your overall health, and your mental health as it could also change your voice and that could lower your self esteem; two, it could also harm the environment that other people live in.
Hope that helps. Change up a few of the words to make it sound like you wrote it, but i hope that's good enough. :)