Inclusion Criteria:

- Child Participant:

- St. Jude Children's Research Hospital (SJCRH) patient with primary diagnosis of
any type of cancer or any sickle cell disease genotype (HbSS, HbSC, HbSβ°thal,
HbSβ+thal, HbSD, HbSO, Hb S/HPFH, HbSE).

- 10 to < 18 years of age at the time of enrollment.

- For cancer patients, at least one month from diagnosis and in active treatment
section at the time of enrollment.

- Lives in a smoking household defined as at least one adult (> 18 years) smoker
who resides in the home. Smoking adults will be defined as those who have
smoked at least one cigarette in the past 30 days, per parent report.

- Does not currently use tobacco (defined as abstinence from tobacco during the 30
days preceding the screening assessment as based on patient and/or parent
report).

- Able to demonstrate satisfactory texting skills via mobile phone as determined
by study research staff.

- Cannot have significant cognitive or learning impairment that precludes
completion of study measures.

- Reads and speaks English.

- Willing and able to provide assent according to institutional guidelines.

- Parent Participant:

- Parent of SJCRH patient who meets criteria as stated above.

- Reads and speaks English.

- Willing and able to provide informed consent according to institutional
guidelines.

Exclusion Criteria:

- Child Participant:

- Patients diagnosed with cancer who have relapsed or have recurrence of disease
within the past month or those with progressive disease.

- Patients in medical crisis as determined by consultation with their primary care
physician.

- On bone marrow transplant service.

- On inpatient service or expected/scheduled inpatient admission (e.g.
hospitalized).

- Acute complications of sickle cell disease requiring hospitalization or an acute
care visit including pain crises, acute chest syndrome, acute cerebrovascular
events/stroke or active infection/fever.

- Patient is residing in St. Jude long-term nonsmoking housing facility (e.g.
Target House or Ronald McDonald House) during the 7-day texting data collection
phase.

- Parent participant:

- Cannot be in crisis or distress or have another disabling condition that would
preclude participation as determined by consultation with patient's primary care
physician and/or social worker prior to study enrollment.