[DanBC]

The question pro-legalisers have to address is the very clear evidence we now have that cannabis use causes psychosis in some users.

Every time people say "It doesn't" that sets back legalisation another 5 years.

[amdavidson]

Link? Everything I've read cannot prove causality, just correlation.

It's very hard to prove causality, especially when marijuana's scheduling does not allow for proper scientific research.