Deuteronomy 23:11
But it shall be, when evening cometh on, he shall wash himself with water: and when the sun is down, he shall come into the camp again. But it shall be, when evening cometh on, he shall wash himself with water: and when the sun is down, he shall come into the camp again.
The verse belongs to instructions given to the Hebrews in the wilderness that required cleanliness in ordinary habits for their physical and moral good. A man who was personally unclean had to remain outside the camp until evening, wash himself with water in the evening, and come back into the camp only after sundown. That exclusion applied even when the impurity was slight.
The washing required before returning covered both the man himself and his clothing, making personal cleanliness the condition for reentering the camp. The rule was both a religious regulation and a sanitary measure, protecting the community from disease. It was God's care to keep the camp from becoming contaminated, to protect the people from uncleanness, and it requires cleanliness of the person, of clothing, and of the surroundings around the camp, teaching care for cleanliness and healthful surroundings.
Applied to tobacco use, a tobacco user would have had to remain outside the camp or give up tobacco, and could return only after cleansing the mouth of its residue.