Inclusion and exclusion criteria
| Inclusion criteria | Exclusion criteria |
| Research that examines the effects of providing genetic risk feedback concerning smoking-related diseases to smokers on smoking cognitions (eg, risk perception) and smoking behaviour (eg, abstinence) | Research that examines the relationship between genotype differences and smoking-related outcomes without informing the smoker about the results of the genetic test |
| Research that examines the relationship between genotype differences and effectiveness of intervention type without informing smokers about the results of the genetic test | |
| Research focuses on clinical utility, ethical considerations, etc, of genetic testing for smoking cessation treatments | |
| Research concerns experimental design that compares the effectiveness of genetic risk feedback on smoking-related diseases on smoking cessation with some control condition | Research concerns cross-sectional, one-group prospective or retrospective designs |
| Participants should be smokers who receive genetic risk feedback about smoking-related diseases | Participants are care providers (eg, nurses or general practitioners) |
| Participants are smokers and related to someone with a smoking-related disease, but are not given feedback about their own genetic profile | |
| Research that examines smokers' interest in undergoing genetic testing as part of smoking cessation treatments | Research that focuses on interest in participating in, attendance or uptake of research about the role of genes in smoking behaviour |
| Research is published in an international peer-reviewed journal and qualifies as original article | Research is unpublished |
| Research concerned editorials, commentaries, book reviews, bibliographies, resources or policy documents | |
| Research reported secondary data analysis or only reviewed other studies |