I'm afraid I'm addicted to legal drugs

I have done the "legal highs" thing many times. There are pills that I think are supposed to simulate cocaine. I have had a problem with these for a while.

I keep on telling myself that I wanna quit. But I do it once a week, every 5-7 days or so. What can I do to stop? It's so hard when these things are sold in stores and easily available and so enjoyable as well. I enjoy it when I do it but afterwards I feel so guilty and hate it.

I want to stop so badly. What can I do? Right now the problem isn't terrible but I don't want it to even get that far.

Please help.