does chewing tobacco cause shortness of breath Affect Your Lungs? Is It Safe to Snuff

doi: 10.1016/S2215-0366(20)30261-3

[1] Since prolonged exposure to air causes snuff to dry out and lose its quality, pocket snuff boxes were designed to be airtight containers with strong hinges, generally with enough space for a day's worth of snuff only

A systematic review and meta-analysis of 26 longitudinal studies found that stopping smoking was also associated with long-term improvements in mental health similar in effect size to taking antidepressants, and the benefit was at least as large in people with psychiatric conditions (Taylor Reference Segan, Baker and Turner2014)

Earlier, six cigarettes had been smoked in that chamber