AceShowbiz - Willie Nelson has reflected on turning 90 and how marijuana played a major role in his life. In a new interview, the "Seven Spanish Angels" hitmaker says marijuana "saved [his] life."

The 89-year-old country music legend, who is due to turn 90 in April, is unsure what has kept him in such good shape as he approaches his milestone birthday but explained that as well as following a healthy diet, smoking the Class B drug was an aid to himself and the people around him because he was "drinking a lot" beforehand.

He said, "I wish I could tell you [how I'm still here]. I really don't know, except that I really do believe in imagining what you want to do and let it happen. And that's my full philosophy and it's working. I don't eat a lot but I drink a lot of protein shakes. I've managed to keep my weight down pretty good, and I really don't do anything that's bad for me. I don't drink as much as I used to. I still take a drink of tequila occasionally, but not like I used to. [Marijuana] not only saved my life, it probably saved some other people's lives because before I smoked marijuana, I was drinking a lot. And I might have killed a lot of people, too. So I'm just glad that that didn't happen. I'm glad we live through all of bad times."

Meanwhile, the "Blue Eyes Crying in the Rain" hitmaker, who is married to Annie D'Angelo, 63, but has eight children from his various relationships, went on add that he believes in "honesty" even when it "hurts" even though it can be a tricky concept for others to get their head around.

He told E! News, "I believe in honesty. I believe in being truthful, even when it hurts. And I think that's a hard one for everybody to grasp. Uh, and that's what I keep telling myself. You know, if you're lying, shut up and tell the truth."