Wong will also meet Tran Thanh Man, the chairman of the National Assembly, and Vietnamese Prime Minister Chinh, who will invite him to an official dinner.
Law and Home Affairs Minister K Shanmugam has rebuked the Law Society of Singapore's vice-president for his comments on the case of a former actor convicted of rape.
Singapore prohibits vaping, and since February 2018, the country has prohibited the purchase, use, and possession of e-vaporizers and associated goods.