Legalization would eliminate the harms caused by prohibition, but it would not eliminate the harms caused by drug use.
Legalization would create a new stream of tax income.
Legalization of drugs would lead to legal drugs being manufactured, which would create income from new taxes.
( z1 create :ARG0 ( z2 legalize ) :ARG1 ( z3 stream :ARG1-of ( z4 new ) :cxnsistof ( z5 income :source ( z6 tax ) ) ) )