That is definitely not true (you can recover from an addiction and there are examples all around you) and a really bad policy to follow if you really want to eradicate addiction, since you are basically marginalizing large groups of people. Saying that you need to "save" those who are not addicted implies that everyone is at risk, but the mechanics of addiction vary from person to person and are heavily influenced by socioeconomic background.
Please refer to professionals that work in this field before proposing approaches like this.