For products such as chewing tobacco, the brownish tobacco will combine with the saliva of the user to produce a liquid dark brown in color which is highly staining
Several risk factors increase the risk of getting this cancer, including tobacco use (smoking, chewing tobacco), alcohol misuse, viral infections (human papillomavirus or HPV, Epstein-Barr virus), a diet lacking in fruits and vegetables, toxic substances, and gastroesophageal reflux disease (GERD)
However, that's not known for sure, and their impact on oral health is particularly unclear, Spindle said
The market for cigarette packs is expanding due to consumer preference for small, lightweight, and attractively designed packs
PLoS One 2017, 12, e0183602 10.1371/journal.pone.0183602