Please select the eligibility criteria that correspond to the clinical trial below.
Title: Effect of a Smartphone Intervention on Quitting Smoking in a Young Adult Population of Smokers: A Randomized Controlled Trial
Brief Summary: The primary aim of this study will be to determine the effectiveness of a smartphone delivered app for young adult smokers on quitting smoking.


Options:
A: Inclusion Criteria:

* Smoke \>4 cigarettes/day for at least 6 months
* Age 21+
* Want to quit and ready to try in next 30 days
* Willing to quit all forms of tobacco (including e-cigs)
* Willing to use Chantix to try to quit
* Have a cell phone able to receive text messages
* Willing to attend 3 visits and use varenicline for smoking cessation
* Plan to live in local area for next 6 months
* Read and write in English
* Women not pregnant and taking steps to avoid
* Able to understand and willing to sign consent

Exclusion Criteria:

* History of allergic reaction or other adverse event while using varenicline
* Used a smoking cessation aid/medicine in past 1 month (including e-cigs)
* Currently pregnant or nursing
* Does not have a mobile phone that can send and receive text messages or unwilling to receive study texts
* Uncontrolled serious mental illness or substance abuse or inpatient treatment for these in the past 6 months
* Uses non-cigarette tobacco products and does not plan to quit all tobacco.
* Has a history of kidney problems or receives dialysis
* Had any thoughts that they would be better off dead or of deliberate self-harm in the prior 4 weeks
* Had a heart attack in the past 4 weeks
* Mental conditions that would prohibit the participant from completing the protocol
B: Inclusion Criteria:

* Age 19 to 29 years
* Currently smoking cigarettes daily or occasionally
* Residing in Canada
* Considering quitting smoking in the next 30 days
* Have an Android or iPhone OS smartphone
* Able to provide informed consent
* English comprehension
* Not referred by a study participant

Exclusion Criteria:

- opposite of the above
C: Inclusion Criteria:

* must have smoked 100 cigarettes during their lifetime
* must currently smoke 5 or more cigarettes a day
* must be in the preparation stage of quitting smoking
* ages 18-59 years
* English speaking
* have a mobile phone with an unlimited texting plan and internet access
* use text messaging at least once a week
* use Facebook daily
* have an active email account
* live in the continental USA

Exclusion Criteria:

* a medical condition that is contra-indicated for nicotine replacement therapy:
* pregnant
* breast feeding
* a recent heart attack
* an irregular heartbeat
* high blood pressure not controlled with medication
* skin allergies to adhesive tape or serious skin problems
* taking a prescription medicine for depression or anxiety
* use drugs or marijuana regularly
* live in the same household with another participant
D: Inclusion Criteria:

* 18 years of age or older
* Currently smoking every day
* Owning a TXT-capable cell phone
* Sent or received TXT messages at least once in the past year
* Living in Ankara (to ease technology support if necessary)
* Agreement to set quit day in 15 days from enrollment date
* Agreement to verification of smoking cessation using a carbon monoxide breath monitor

Exclusion Criteria:

• No chronic disease.

Answer: B