If you're into playing guitar or if you're into the Smiths at all, the video I posted below is REQUIRED viewing. The footage was taken from an old BBC documentary The Story of the Guitar and features Johnny Marr discussing his influences, riffs, and how he was drawn to the guitar at a young age. Bonus: Marr explains how the riff from "How Soon As Now" became that much better by using tremolo.
In this segment Marr discusses "How Soon Is Now" (at ~2 minutes in)
Marr explains how he was drawn to the guitar from an early age:
Marr discusses the relationship between a guitar player and singer in a band: