| Name | Info | Provider | Link |
|---|---|---|---|
| Quitting Smoking | free resource | MedlinePlus Health Information | https://medlineplus.gov/quittingsmoking.html |
| free resource | PubMed Central | https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/33162795/ | |
| free resource | Europe PubMed Central | https://europepmc.org/abstract/MED/33162795 | |
| free resource | Ivyspring International Publisher | https://www.medsci.org/v17p2673.htm |