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Sources:

(Knuckle Cracking)
https://www.ncbi.nlm.nih.gov/pmc/arti…
https://www.ncbi.nlm.nih.gov/pmc/arti…
https://onlinelibrary.wiley.com/doi/e…
https://link.springer.com/article/10….
https://press.rsna.org/timssnet/media…
https://www.loc.gov/rr/scitech/myster…
https://www.aurorahealthcare.org/serv…

(Gum Chewing)
https://www.ncbi.nlm.nih.gov/pmc/arti…
https://www.tandfonline.com/doi/abs/1…
https://www.ncbi.nlm.nih.gov/pubmed/1…
https://www.ncbi.nlm.nih.gov/pubmed/2…
https://www.ncbi.nlm.nih.gov/pmc/arti…
https://www.ncbi.nlm.nih.gov/pubmed/2…

(Swearing)
https://www.sciencedirect.com/science…
https://www.emeraldinsight.com/doi/ab…
https://www.academia.edu/29725191/Fra…
https://journals.lww.com/neuroreport/…
https://www.wired.com/story/the-scien…

(Nail biting)
https://pediatrics.aappublications.or…
https://www.sciencedirect.com/science…
https://www.researchgate.net/publicat… https://www.elitedaily.com/life/cultu…
https://www.mayoclinic.org/healthy-li…
https://www.baos.org.uk/resources/Tem…
https://danieladental.com/tmj-treatment/

(Complaining)
https://journals.aom.org/doi/abs/10.5…
https://onlinelibrary.wiley.com/doi/a…
https://psycnet.apa.org/record/2002-0…
https://www.psychologytoday.com/gb/bl…
https://digest.bps.org.uk/2017/03/23/…
https://www.cambridge.org/core/journa…

IMAGES

https://www.youtube.com/watch?v=_ZNEN…

https://en.wikipedia.org/wiki/Metacar…

https://commons.wikimedia.org/wiki/Fi…