Smoking and chewing of tobacco in relation to cancer of the upper alimentary tract.
D004938:Esophageal Neoplasms; D006801:Humans; D008409:Mastication; D009062:Mouth Neoplasms; D010610:Pharyngeal Neoplasms; D010614:Pharynx; D012907:Smoking; D014062:Tongue Neoplasms; D014026:Nicotiana
ESOPHAGUS/neoplasms; MOUTH/neoplasms; PHARYNX/neoplasms; TOBACCO/injurious effects; TONGUE/neoplasms