Before 1992, Singaporeans discarded an average of 525 pieces of used chewing gum carelessly every day. That was enough to clog elevator doors, keyholes, and, most expensively, the door sensors of the MRT system.
One year after the government imposed a complete ban on the sale, import, and manufacture of chewing gum, the number of such incidents fell to just two cases per day.
The Housing and Development Board (HDB), the agency responsible for Singapore's public housing, had previously spent around SGD 150,000 (approximately USD 88,000) each year just to remove discarded chewing gum from elevators and corridors.
After the ban took effect on January 3, 1992, those costs almost disappeared. More importantly for the government, MRT services were no longer disrupted by train doors jammed with chewing gum.
A Threat Initially Rejected
The idea of a complete ban had actually been proposed nine years earlier. In 1983, Teh Cheang Wan, then Minister for National Development, raised concerns about used chewing gum being stuck on mailboxes, keyholes, and elevator buttons in public housing estates.
At the time, cleaning costs had already reached around SGD 150,000 (approximately USD 88,000) per year. Lee Kuan Yew, who was prime minister at the time, considered a total ban too drastic and rejected the proposal.
Instead, the government opted for less restrictive measures. The Singapore Broadcasting Corporation was instructed to stop airing advertisements promoting chewing gum.
School canteens were told to stop selling it, while littering offenders were fined and educated about proper disposal. Even the opposition agreed that the problem should be addressed through fines and public education rather than a complete ban. However, these measures failed to change public behavior.
The Turning Point Underground
What ultimately changed the government's calculations was the Mass Rapid Transit (MRT) system, a USD 5 billion railway network that began operations in 1987.
In July and August 1991, vandals began sticking chewing gum onto the train door sensors, preventing the doors from closing properly.
Any affected train had to be withdrawn from service, and its passengers transferred to the next train. Such disruptions were unacceptable for a transport system that had only recently been built with a massive investment.
Only two incidents were officially recorded during that period. However, the perpetrators were never identified, and the repairs were costly. The government's inability to hold individual vandals accountable ultimately led it to impose a complete ban, rather than relying on case-by-case enforcement against acts of vandalism.
A Ban That Took Effect in Just Four Days
Prime Minister Goh Chok Tong, who had recently succeeded Lee Kuan Yew, announced the ban through The Straits Times. The regulation officially took effect just four days later, on January 3, 1992. From that point on, the sale, import, and manufacture of chewing gum were completely prohibited in Singapore.
The penalties were severe. Under the Regulation of Imports and Exports (Chewing Gum) Regulations, anyone caught importing chewing gum could be fined up to SGD 100,000 (approximately USD 59,000) or imprisoned for up to two years for a first offense.
Repeat offenders faced fines of up to SGD 200,000 (approximately USD 118,000) or imprisonment for up to three years.
Retailers caught selling chewing gum could be fined up to SGD 2,000 (approximately USD 1,180). The government also publicly disclosed the identities of convicted smugglers to deter others from violating the law.
Relaxed for Trade, Not Health
The ban remained fully in place for 12 years, until March 2004, when Singapore relaxed it as part of its Free Trade Agreement with the United States. According to the U.S. Senate Report 108-117, Singapore agreed to allow the import of chewing gum with therapeutic value as one of the conditions of the agreement.
Since then, nicotine gum, dental gum, and other therapeutic chewing gums have been permitted in Singapore. However, they may only be sold through registered doctors or pharmacists, who are required to record the identity of each purchaser. They are not available for general retail sale.
From the beginning, what the law prohibited was not the act of chewing gum itself, but its sale, import, and manufacture. As a result, both residents and tourists have always been allowed to bring a reasonable amount of chewing gum into Singapore for personal consumption.
The ban also attracted global attention. It was frequently cited by Western media, including Newsweek, as an example of Singapore's strict regulation of everyday public behavior. At the same time, it reinforced the country's reputation as one of the cleanest cities in the world.
