I used to read tons in high school, then got out of the habit. Oddly enough, the thing that got me back into reading was ebooks on my smartphone because I was traveling a lot for work.

I've always got my phone with me and my ebook reader keeps my place in my book. If I'm in transit for 15 min or an hour then I can pull out a book that keeps right where I left off. Even on break at work I can read for 10 or 20 minutes. Eventually I found that I was in the habit again and reading roughly as much as I did in high school.

There are tons of free eReader apps for phones. There are tons of free ebooks on places like Project Gutenberg. My average ebook is 0.5 MB, so why not toss a bunch on your phone?

Just be sure to spend a reasonable amount of time fiddling with your eReader settings to make it comfortable. Many have lots of customization options and I didn't like the defaults so it took a little while to find my comfort zone. eg, I love white text on black background.