What happened on New Year's Eve in Crans-Montana has once again put sparkling candles at the center of attention: little - seemingly harmless - firework sticks that brighten up cakes, desserts and even champagne flutes during parties and celebrations. But aside from the fire hazard, dramatically demonstrated by the Swiss incident, another, lesser-known risk lurks in these products.

As the household settles down and the lights go out, some minds are just beginning to race.