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Description
Theyve been talking about this for over 10 years now

Oral versus intramuscular administration of vitamin B12 for vitamin B12 deficiency in primary care: a pragmatic, randomised, non-inferiority clinical trial (OB12)
PMID 7891246

However, smoking is also linked to several other types of cancer, including throat, mouth, bladder, pancreas, liver, kidney, and cervical cancer

The data on this is solid - quit lines work, and they roughly double the effect when combined with medication
