去古巴要购买医疗保险吗？

订了加拿大网站去古巴的旅游，细则里面有：For Travellers to Cuba: All visitors entering Cuba are now required to provide
proof of health insurance coverage or must buy coverage at the Cuban
airport.
一定要购买或者到古巴机场后购买医疗健康保险。海关会查吗？到机场后购买麻烦吗？谢谢！