Number of longitudinal studies that identified a specific factor as statistically significantly associated with self-initiated smoking cessation of a duration of at least 6 months among adolescents and young adults, from among all population-based studies that investigated the variable
| Factor | No. of studies in which factor was statistically significantly associated with cessation/no. of studies which investigated the factor |
| Sociodemographic factors | |
| Age | 0/3 |
| Gender | 1/3 |
| Ethnicity | 1/5 |
| High socioeconomic status | 0/2 |
| Higher/poor levels of parental education | 2/3 |
| Higher education | 2/5 |
| Good raising children | 0/1 |
| Attending fewer different schools | 1/2 |
| Living with both biological parents | 2/4 |
| Parent communication | 0/1 |
| Married | 1/2 |
| No part-time work | 0/2 |
| Psychosocial factors | |
| Good mental health | 1/3 |
| No major depressive disorder | 0/1 |
| No dysthymia | 0/1 |
| No anxiety disorders | 0/1 |
| No attention-deficit hyperactivity disorder/disruptive behaviour disorder | 0/1 |
| No borderline personality disorder scores | 0/1 |
| No antisocial personality disorder scores | 0/1 |
| No intentions to smoke cigarettes | 3/3 |
| High cigarette resistance self-efficacy | 3/4 |
| Negative beliefs about smoking | 3/5 |
| Antismoking beliefs | 1/1 |
| Positive consequences of smoking | 0/3 |
| Less rebellious | 1/4 |
| No thrill seeking | 0/1 |
| Less delinquent | 1/3 |
| Less deviant | 0/1 |
| Not being victimised (sexual and non-sexual) | 0/1 |
| Behavioural factors | |
| No problem behaviours | 0/1 |
| No alcohol use | 1/6 |
| No drug use | 1/3 |
| No drug selling | 1/1 |
| No criminal behaviour | 0/1 |
| Good physical health | 2/3 |
| Academic intentions | 0/1 |
| Pregnancy | 0/2 |
| Social influences | |
| No friends smoking | 5/7 |
| No perceived prevalence of smoking | 0/5 |
| No parents smoking | 1/3 |
| Late parents' quitting | 0/1 |
| Early parents' quitting | 1/1 |
| No siblings smoking | 1/3 |
| No household smoking (parents or siblings) | 0/1 |
| Friend disapproval of cigarette use | 0/3 |
| Parent disapproval of cigarette use | 2/3 |
| Parents/friends' disapproval of cigarettes | 0/1 |
| Community disapproval of cigarette use | 0/1 |
| Friend support | 1/3 |
| Parental support | 1/5 |
| No cigarette offers | 2/3 |
| Exemplars | 0/4 |
| School attachment | 0/1 |
| Community attachment | 0/1 |
| Living without children | 1/1 |
| Moving in with spouse or partner | 0/1 |
| Becoming parents | 0/1 |
| Becoming parents x gender | 0/1 |
| No family history of affective disorder | 0/1 |
| No family history of anxiety | 0/1 |
| No family history of drug and alcohol use | 0/1 |
| No familial history of externalising | 0/1 |
| Smoking related variables | |
| Older age at first cigarette use | 3/5 |
| Older age at first daily smoking | 0/1 |
| Low frequency of smoking | 2/3 |
| No nicotine withdrawal | 0/1 |
| No nicotine dependence | 1/1 |
| No cigarette availability | 0/1 |