Two main environmental issues caused by tofu production are its waste and wastewater and the strong smell of its whey.  Most tofu producing industries dispose of the waste to the drainage channel in the neighborhood so as to make the surrounding community protests against it. Up to now, tofu production still includes some ingredients which have harmful effects on people. Vinegar is one of the ingredients that can cause gastric ulcer because of its acidity. Another ingredient, a preservative, is often included in the production.