You wouldn't guess that The Dalai Lama and Justin Bieber have much in common, but you'd be wrong. Both are now supporters of the legalisation of medical marijuana.

Biebs joins the likes of Rihanna, Susan Sarandon, Snoop Dogg, Jack Black, and Wood Harrelson, as celebrity advocates for the drug.

The Canadian singer spoke out against pharmaceutical companies blocking the legalisation of medical marijuana, tweeting to his 86 million followers, "This is important. I’m going to be talking more about this. We all need to pay attention.”

He also shared a link to an ATTN video that explains the current conflicts between giant pharmaceutical firms and medical marijuana proponents.

Watch the video below.

This is important. A friend showed me this. I'm going to be talking more about this. We all need to pay attention https://t.co/u4tzbEkFo5

— Justin Bieber (@justinbieber) October 2, 2016