because ellipsis is a literary resource that consists in the omission or deletion of part of the content of a sentence, which, although grammatically necessary, is implicit in the context. That is called elliptical construction.
It can also be used as a narrative resource, insofar as important portions of the content of a work are omitted (a novel, for example, or a movie), so that the reader can deduce or infer them from what is said.
Well, for example, if they have low self-esteem they can develop depression and anxiety and that can cause them to use t o b a c c o and a l c o h o l and other d r u g s.
