Cigarettes are highly addictive.

香烟非常容易使人上瘾。

《柯林斯英汉双解大词典》

Nicotine is a highly addictive substance.

尼古丁是一种高度致瘾的物质。

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Quitting isn't easy because smoking is highly addictive.

戒烟是不容易，因为抽烟极易上瘾。

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Talks are being held over betting machines after Medway Council raised concerns they were "highly addictive".

BBC: Betting machine

Activists hope to paint food as, like tobacco, a highly addictive threat to public health.

FORBES: How Everybody Can Win the War Against Big Food

After all the big source of e-cig stimulation is the nicotine, long accepted as a highly addictive substance.

FORBES: Altria Group: E-Cigarettes Or Die?