[djm]

I meant corporation tax revenue from businesses that gain income by selling stuff to people who are paying with drugs money.

edit: I'm not sure I'm explaining myself very well so let me just spell it out:

If it was legalised and taxed they would receive sales tax income (VAT or whatever they call it in greece), and probably additional tax income from likely "harmful substance" taxes (like those applied to alchohol, cigarettes, petrol etc). At the same time the folks who had been selling drugs illegally would lose income and thus reduce their own spending in the economy.

The result would be increased revenue for some businesses (who started legally selling the dope) and reduced revenue (& thus corporation tax) for all of the other businesses who didn't.