If anyone is interested I'll describe the procedure for removal of squamous cell carcinoma from someone who has oral cancer. Lets just say after I describe it you won't want to put a dip in your mouth.
Imagine never being able to taste food again. Scratch that, imagine having all of your food given to you via a tube placed in your stomach because they had to remove half of the muscles in your face, your tongue, half of your esophagus and a good part of your larynx because the cancer had invaded those areas of your mouth and throat. You get to breath out of a tracheostomy, your scarred up like you walked into a weedeater and you will never speak again.
This is worst case scenerio but I have taken care of patients with radical neck surgeries like this. Not one of it found the experience pleasant. Almost all of them dipped or were heavy cigar smokers.