1. http://www.vice.com/read/why-are-your-dreams-suddenly-so-intense-when-you-stop-smoking-weed-876
2. http://www.huffingtonpost.co.uk/jamie-flexman/depression-mental-illness_b_3931629.html
3. https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/462885/drug-misuse-1415.pdf
4. http://www.independent.co.uk/news/uk/crime/uk-is-the-addiction-capital-of-europe-report-claims-8793170.html
5. http://time.com/3946904/heroin-epidemic/
6. https://www.ted.com/talks/johann_hari_everything_you_think_you_know_about_addiction_is_wrong/transcript?language=en
7. https://www.rsph.org.uk/our-work/policy/protecting-the-public-s-health/taking-a-new-line-on-drugs.html
8. http://www.huffingtonpost.com/johann-hari/7-facts-about-drugs-that-will-make-you-question-everything_b_9484744.html