side effects of dipping tobacco the chewing effects of chewing tobacco Figure 2 from Health effects of Smokeless Tobacco and Health Effects:

Even if you dont inhale, exposure to these substances can still pose health risks, including oral, throat, and lung cancers

You can also spread other nasties, like the herpes virus and tuberculosis, via the shared mouthpiece

But if given the chance, bats will readily move into wall voids under the siding or into attic spaces

Health 41 , 152 (1994)

The term "tobacco" includes chewing tobacco, cigars, cigarettes, snuff that contains tobacco, pipe tobacco and dissolvable tobacco products and electronic cigarettes (a device that is capable of providing an inhalable dose of nicotine by delivering a vaporized solution)