1. https://www.aihw.gov.au/reports/illicit-use-of-drugs/ndshs-2016-key-findings/contents/highlights-from-the-2016-survey
2. Royal College of Physicians 2016 https://www.rcplondon.ac.uk/projects/outputs/nicotine-without-smoke-tobacco-harm-reduction-0
3. National Health and Medical Research Council 2017 https://www.nhmrc.gov.au/_files_nhmrc/file/publications/17072_nhmrc_-_electronic_cigarettes-web_final.pdf
4. U.S. Department of Health and Human Services https://www.surgeongeneral.gov/library/reports/50-years-of-progress/full-report.pdf
5. Financial stress and smoking within a large sample of socially disadvantaged Australians;Guillaumier;Int J Environ Res Public Health,2017