Re: Brings a new consideration to the phrase
1. If we look at the Netherlands, we see the possibility of drug use going DOWN because the "forbidden fruit" effect is gone (some people will partake simply because it's illegal--sticking it to The Man and all).
2. Once it's legal, drugs can be regulated. Manufacturers can be inspected and quality controls enacted. IOW, you can help make sure that whatever goes out is as safe as you can expect from it. The users than inherit whatever risks are inherent with the drug.
3. You can still ban specific drugs for significantly justifiable reasons (for example, drugs with a very easy tendency to overdose so whose safety can't be controlled).
Take a look at the US and alcohol. Was alcohol easier to control DURING Prohibition...or AFTER Prohibition?