抽烟时吸入的尼古丁和一氧化碳都已经被标定为致病因素。用英语怎么说？

抽烟时吸入的尼古丁和一氧化碳都已经被标定为致病因素。

Both nicotine and carbon monoxide inhaled with cigarette smoking have been incriminated as causative factors.

both

adj. 二者，两者都；pron. 二者；adv. 二者，二者都；conj. 不仅…而且…，…和…都；

例句
The gym can be used by both able-bodied and disabled people.
这家健身房健全和残障人士都可使用。

nicotine

n. 尼古丁，[化]烟碱；

例句
Both nicotine and carbon monoxide inhaled with cigarette smoking have been incriminated as causative factors.
抽烟时吸入的尼古丁和一氧化碳都已经被标定为致病因素。

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

carbon

n. [化学]碳，（一张）复写纸，[电]碳精棒[片，粉]，碳精电极，复写的副本；adj. 碳的，碳处理的；

例句
...the abatement of carbon dioxide emissions.
二氧化碳排放的减少

monoxide

n. 一氧化物；

例句
Both nicotine and carbon monoxide inhaled with cigarette smoking have been incriminated as causative factors.
抽烟时吸入的尼古丁和一氧化碳都已经被标定为致病因素。

inhaled

v. 吸入( inhale的过去式和过去分词 )；

例句
Both nicotine and carbon monoxide inhaled with cigarette smoking have been incriminated as causative factors.
抽烟时吸入的尼古丁和一氧化碳都已经被标定为致病因素。

with

prep. 和，跟，随着，关于，和…一致；

例句
A waiter entered with a tray...
侍者端着托盘进来了。

cigarette

n. 纸烟，香烟；

例句
People's cigarette smoke seemed to hang in the air.
人们吸烟的烟雾似乎会长时间滞留在空气中。

smoking

n. 吸烟，抽烟；v. 冒烟( smoke的现在分词)，抽烟，用烟熏制，吸（烟）；

例句
Cigarette smoking used to be commoner among affluent people.
吸烟曾经在富人中间更为普遍。

have

aux. 用以构成完成式及完成式的不定式，表示已经…；vt. 有，具有，拿，取得，从事，必须，不得不；n. 〈口〉有产者，有钱人，富国，〈英俚〉欺骗，诈骗；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

been

v. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质（ be的过去分词 ），在，存在，不受干扰，去过了，be的过去分词；

例句
Have you been able to have any kind of contact?...
你联系上了吗？

incriminated

v. 使（某人）显得有罪，牵连，归罪于( incriminate的过去式和过去分词 )；

例句
Both nicotine and carbon monoxide inhaled with cigarette smoking have been incriminated as causative factors.
抽烟时吸入的尼古丁和一氧化碳都已经被标定为致病因素。

as

adv. 同样地，一样地，例如；prep. 作为，以…的身份，如

例句
As far as I can recall, Patti was a Smith.
我记得帕蒂是姓史密斯的。

causative

adj. 成为原因的；

例句
Both nicotine and carbon monoxide inhaled with cigarette smoking have been incriminated as causative factors.
抽烟时吸入的尼古丁和一氧化碳都已经被标定为致病因素。

factors

n. 因素( factor的名词复数 )，<数>因子，（增或减的）数量，系数；

例句
Forster established the essentiality of minerals as accessory food factors required for maintaining life.
福斯特证实了矿物质作为辅助食物因子在维持生命方面的重要性。