Question

Why are chewing tobacco and snuff often-called spitting tobacco?

Answer 1

Chewing tobacco and snuff often-called spitting tobacco because after you chew the tobacco you will be forced to spit saliva out

Answer 2

Chewing tobacco and snuff often-called spitting tobacco because after you chew the tobacco you will be forced to spit saliva out.
These tobacco called smokeless tobacco because it consumed by chewing it in your mouth. This will increase saliva production and make spitting to prevent it to build up.