Snuff is regulated as food according to the Swedish Food Act 2006:804
§ 3 The Act applies to all stages of production, processing and distribution of food. In the Act the following are treated as food
1. water from the point at which it is taken into a waterworks to the point of compliance as defined in Article 6 in Council Directive 98/83/EC of 3 November 1998 on the quality of water intended for human consumption, as amended by Regulation (EC) No 1882/2003 of the European Parliament and of the Council, and
2. snuff and chewing tobacco.
Whether that's the same thing as snus I'm not 100% sure - I actually had to google what 'snus' is
Looking at BRC clauses and I.G for both 4.8.6 and 4.8.7 I can see why the auditor referenced both - I can see an argument for both and neither. 4.8.7 (focuses on food) does mention in the I.G that it includes chewing gum), perhaps the closest resemblance of snuff? If you have a smoking area that is also a permitted eating area I guess this would be ideal to define the designated "snuf area" to ensure it isn't a risk to food production/storage.