The Since U Been Gone singer has been outspoken about social and political issues in the past, and now she's become the latest celebrity to endorse making pot lawful in America.

In an interview with Rolling Stone, Clarkson says, "I'm not even a pothead, I just think it's funny that we legalise something as destructive as alcohol or pills and not that. Don't get me wrong, I love me some alcohol, but I don't know anybody in rehab because of pot. And I know a ton of people that have died either from liver cancer or behind the wheel.

"We legalise things that are so disturbing for our bodies, but one that's completely fine, we say, 'No, that's bad for you.' I'm like, 'Okay, enjoy your scotch. Enjoy your (anti-anxiety medication) Xanax.'"

Medical marijuana is now legal in states including Colorado, Washington, Alaska and Oregon.