Edible alkali is nothing, but it produces carbon dioxide and water, which is harmless. Sugar and cooking oil are both organic substances. If they are not burned sufficiently, carbon monoxide will be produced, just like gas poisoning. I don't know how this person will react. Edible salt is sodium chloride, which should not produce gas after burning. If possible, it is hypochlorite, which is toxic. Kenting is toxic after burning plastic bottles, but it is not very serious. It may be chlorine poisoning. I suggest drinking some milk.