(Portland, OR)  --  This week, the Multnomah County Commission will take up a proposal regarding regulation of the sale and use of e-cigarettes.  The county health department is scheduled tomorrow to go before the Portland City Council with a preview of the proposal, which would ban minors from buying and using e-cigarettes and ban "vaping" where smoking tobacco is currently outlawed.  Health officials say more than ten percent of high-school students in the county have tried e-cigarettes.