False - It is not illegal to chew gum in Singapore, but it is against the law to import it and sell it.
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One of the most highly talked about laws in Singapore, is the “Chewing Gum Law”. In 1992, after years of vandalism in elevators, mailboxes, and on sidewalks, the government of Singapore decreed all gum illegal to stem the amount of sticky stuff on elevator buttons and on stair railings.
Only in 2004, after pressure from the US and other governments, the law was revised to allow chewing gum for therapeutic, medicinal, or dental reasons, however it is illegal to sell and import gum on the island. Tourists in-transit, West Malaysians, and gum for research purposes are exceptions of gum chewing allowed in Singapore, however this is still contingent on approval from the government.
Singapore Statutes Online states chewing gum penalty fines for first-time convictions may range up to $100,000, a prison sentence of up to two years, or both. Plus, penalties rise with each subsequent conviction.
Word to the wise, leave your gum at home!