Now read the following sentence and – as you do so – identify the main subject and verb of the sentence.
Provided that ongoing e-cigarette use has similar effects to long-term nicotine-replacement use, for heavy smokers with a high risk of relapse, long-term e-cigarette use may also assist with preventing relapse.
Hajek P et al The New England Journal of Medicine 2019 A Randomized Trial of E-Cigarettes versus Nicotine-Replacement Therapy
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