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... comes standard on the Smart for a reason : the car probably won't stay on the road without it.
The Smart was launched in Europe 10 years ago, around the same time as the Mercedez-Benz (short, tall) A-Class, which famously flunked the standard 'Elk test' and would roll over without electronic stability control.
The Smart was originally designed by Mercedes-Benx -- no wonder they would not release it without ESP.
BTW -- after 10 years 'on the road' in Europe, the Smart remains a marginal presence and is widely discarded as a joke.