This innovative study will compare a newly developed smartphone application for Acceptance and Commitment Therapy (ACT) to a smartphone application for traditional cognitive behavioral therapy (CBT).

The study matches these National Cancer Institute (NCI) research funding priorities: (1) increasing the dissemination of smoking cessation treatments and (2) new treatment approaches to boost the effectiveness of cessation interventions.

Inclusion Criteria:

• age 18 or older
• smokes at least five cigarettes daily for at least past 12 months
• wants to quit in the next 30 days
• interested in learning skills to quit smoking
• willing to be randomly assigned to either smartphone application
• resides in US
• has at least daily access to their own personal Apple iPhone 4, 4s, or 5
• knows how to login and download a smartphone application from Apple's "App Store" Store
• willing and able to read in English
• not participating in other smoking cessation interventions (including our other intervention studies)
• has never used the NCI's Quit Guide smartphone application.]
• willing to complete one follow-up survey
• provide email, phone, and mailing address.

Exclusion Criteria:

• The exclusion criteria are the opposite of the inclusion criteria above.