Despite all this, many researchers are not convinced. They point to the fact that many afflictions have been known to disappear spontaneously, with or without a daily dose of laughter. They also say that while optimism in general does seem to be related to better health, it is hard to tell which comes first.
尽管如此，许多研究人员并没有被说服。他们指出，事实上不论病人是否接受日剂量的笑疗，很多苦恼都会自动消失。他们也表示，虽然一般看来乐观的心态确实与健康有联系，但是很难确定这两者哪个在先。