Hope is never lost. As long as you're still here, there is always hope. Even if it doesn't feel like it right now.
My vice was alcohol, and I felt like my cravings during the first few weeks of sobriety were going to be the end of me. After a few weeks of staying sober, however, I have noticed the cravings have diminished significantly, and I'm actually beginning to feel NORMAL being sober.
And if you've tried and failed a thousand times, oh well... so have MOST or all of us in here when it came to getting sober. Pick yourself up again and keep going! You can absolutely do this.