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Another program using similar techniques but targeting IDUs social networks rather than individuals proved to be very effective in preventing the spread of HIV

He said the agency allowed them to be sold to see if they could serve as an effective "off-ramp" for adults addicted to combustible cigarettes but the concern about increasing rates of young people using e-cigarettes has grown enough to warrant more restrictions

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Hadi Natural and Medical Sciences Research Center, University of Nizwa, Nizwa, Oman Sobia Ahsan Halim & Saeed Mohammadi Biochemistry Department, Ain Shams University, Cairo, Egypt Nadia M