NHS – Stop Smoking Treatments
https://www.nhs.uk/conditions/stop-smoking-treatments/

Istituto Superiore di Sanità
https://www.iss.it/numeri-verdi?

American Cancer Society – Ways to Quit Tobacco Without Using Medicines
https://www.cancer.org/healthy/stay-away-from-tobacco/guide-quitting-smoking/other-ways-to-quit-smoking.html

World Health Organisation
https://www.who.int/selection_medicines/committees/expert/17/application/NRT_inclusion.pdf?ua=1

Mayo Clinic – Quit smoking products
https://www.mayoclinic.org/healthy-lifestyle/quit-smoking/in-depth/quit-smoking-products/art-20045599

Healthline - Top 10 Products to Help You Quit Smoking
https://www.healthline.com/health/quit-smoking/products-to-help-you-quit-smoking#Support-Tools

Healthline – Nicotine Withdrawal Treatment
https://www.healthline.com/health/smoking/nicotine-withdrawal#treatment

Lloyds Pharmacy – Stop Smoking Treatments and Medication
https://lloydspharmacy.com/blogs/stop-smoking-advice/stop-smoking-treatments