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I recently wrote one letter about the Passive smoking effects to practice my self in writing , in one paragraph i wrote: "the passive smoking phenomenon according to many researches can cause a variety of diseases like...."

Some one told me that the expression «according to many researches" is wrong, could some one help me to correct it please?

Thanks in advance.
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Hi,

according to many researchers

according to a lot of research

Clive
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hi!

we say "much research" rather than "many researches".
Strange, but Cambridge dictionary says it's ok to use researches...
research noun [ U ] uk /rɪˈsɜːtʃ/ /ˈriː.sɜːtʃ/ us /ˈriː.sɝːtʃ/ /rɪˈsɝːtʃ/ UK also researches [ plural ]
UK His researches in the field of disease prevention produced unexpected results .
which one is correct?

This methods..... or this method........

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Since then, much research has been done in this area, and scientists have found that graphene has unique and strange properties