About 3 decades ago in Singapore, chewing gum was causing serious maintenance issues with miscreants disposing spent gums in mailboxes, key holes, on lift buttons and seats of buses and even on door sensors of MRT trains, thereby preventing them from functioning properly. Further, chewing gum left on ground, stairways and pavements were deemed to be increasing cleaning costs and damaging cleaning equipment. So, in 1992, chewing gum was banned and imports immediately halted. It was later revised to allow only therapeutic gums sold by pharmacists and dentists to customers with medical prescriptions.
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