I've really been wondering about the long term effects of marijuana smoke, in particular the bewildering strains that have been bred in response to market forces and growing constraints over the past 50 years. I have a feeling that it is going to be the Millennial generation's "why didn't anyone tell us!" chronic health problem.

Pointless anecdata: a conversation with a coroner in Washington State reveals his observation that since legalization occurred the lung quality of younger folks dying for unrelated/accidental reasons has been atrocious.