chewing tobacco lip use still high among airmen, surgeon general says Chewing Tobacco VS Dip –

Normally, oral bacteria are swallowed and pass through the digestive system, but smoking seems to enable them to colonize the gut mucosa

No-one at all

In summary, 22 out of 37 included studies received low risk of bias note [12, 20, 21, 23, 2729, 31, 3436, 3841, 44, 4649, 54, 55], 11 out of 37 were identified as moderate risk of bias [22, 2426, 32, 33, 37, 43, 45, 51, 52] and 4 studies received high risk of bias note [30, 42, 50, 53]

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The Bible doesnt have any strict verses against it