cigarette smell in mouth How to Get Rid of Breath: 5 Recommended Methods how to hide cigarette smell
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Nicotinic receptor partial agonists as novel compounds for the treatment of smoking cessation Expert Opin Investig Drugs 2008;17:1473-1485
It does not make any claim that nicotine pouches are safe, safer than cigarettes or other tobacco products, or effective for smoking cessation

Further information can be found on the Indoor Smoking Act section of the New Hampshire Department of Health and Human Services website

So, while it is evident that the only way to fully do away with unwanted secondhand smoke exposure is by completely banning smoking in an indoor space, using an air purifier might at least help mitigate the adverse health effects and reduce the unpleasant odor
Removing nicotine stains can be difficult if the room has been exposed to smoke over a long period of time