I love Singapore! It's truly a fine city (it's clean and safe, thanks to strict, no-nonsense enforcement of the law - and yes, "fine" city because breaking the law will result in a stiff fine).
Like any country, Singapore has many "weird" laws - here's a summary: Link - Thanks Zaini!
Singapore banned chewing gum in 1992 because of a litter problem and serious breach of health and safety regulations on the Mass Transit Trains (MRT).
The pristine Singapore city-state, did not like gum sticking to its pavements, but the rules have been relaxed as part of the Free Trade Agreement (FTA), which came into effect at the start of the year 2004.
The government of Singapore will allow the sale of Nicorette, a nicotine gum, because the agreement with the US says "therapeutic" brands should be allowed.
But Singapore has not removed its strict ban completely, agreeing only to allow sales of "therapeutic" gum in pharmacies, and only to those with a prescription as well as for medicinal purposes. By Altaff Aumeeruddy