Lead singer Finn Martin said he hoped Original Sin would do well this time "but we do realise rockquest, even if you don't win, it's a good experience".
"Even though we didn't win the regional final [last year], we still managed to get exposure and play a few gigs. Just because you don't get through, there's still so many other opportunities."
Smokefreerockquest is New Zealand's only all original youth music competition and this year is its 25th anniversary.
The regional heats run every weekend until July 13, then the top regional bands and solo/duos submit videos to be selected for the national finals in Auckland in September.
Organisers introduced two rockquest categories this year - solo and band - instead of just one overall category.
Winners' prize packages include recording of their single, radio and television play of the single, and musical gear worth $13,000.