I prefer using e-textbooks for my studies.

I downloaded the e-textbook for my biology class.

I received several e-messages from my friends.

I have multiple e-mailboxes for different purposes.

I received a new message in my e-mailbox.

I received an e-message from my friend.

I saw him smoking an e-cig outside the office.

I saw a group of e-cigs at the store.

I filled out my e-ballot for the election.

The election committee counted the e-ballots to determine the winner.