he has been healyhy/health since he stopped smoking 用哪个?加不加Y

healthy,healthy是形容词,意思是健康的,而health是名词,意思是健康.
具体用法如下：
healthy
健康的,健壮的
That book is not healthy reading for a child.
那本书很不健康,不适宜孩子阅读.
有益于健康的
Swimming is a healthy pleasure.
游泳是一种有益于健康的娱乐活动.
兴旺发达的,发展良好的
The country's economy is not very healthy.
国家的经济不很景气.
health
n.
健康(状况)
His general state of health is fairly satisfactory.
他总的健康情况相当令人满意.
健康,卫生
Good health is above wealth.
健康胜于财富.

当然是healthy，因为healthy是形容词。health是名词。形容词用法和名词用法很易区分的。