"I feel like it's funny. I've just now come to this place where I'm in my own clarity and I'm not drinking and I'm not smoking weed and I'm exercising," Nelson reflects to PEOPLE. "And my heart ...

Lukas Nelson knows exactly what kind of mark he wants to leave on the world – and he's determined to do whatever it takes to make it happen. The Grammy-winning artist, 36, tells PEOPLE in honor ...