Unless the unintended consequence is that you bring in theft, and other assorted crime to fund the habit. Oh, and a lack of motivation is the governments problem when that individual can't, or won't work due to his addiction, then he get federal aid.
The increase of heroin use is a concern, since it IS a highly addictive drug. Making it illegal doesn't solve that problem, it only creates a criminal distribution problem we don't need. Addressing the addiction and increased use has to be by education.
It takes at least 20 years to change a culture through these means, longer if there is a fight. Your willing to wait and let things deteriorate until that happens?