[binreadin]

This is a typical instance where absence of evidence is not evidence of absence. THEY DON’T COLLECT INFORMATION ON POT SMOKING when information is gathered on every cancer patient in the nation. (Did you know that? —it’s mandated by law.) If the pot smoking is not listed via an ICD-9 code, the information is not recorded for the patient, as that would be considered a violation of their privacy, and as drug use, it is covered even more strictly by the medical record privacy laws. I can guarantee you anecdotally after reviewing thousands and thousands of cases that regular pot smokers have a LOT of extra head and neck cancers. We are, however, forbidden to gather that information.

[Wolfie]

So if something is associated with increased cancer risk, we should lock up the person who uses it?

[ConservingFreedom]

This is a typical instance where absence of evidence is not evidence of absence.

It's certainly not evidence of presence either. And it has been studied - whatever the limitations of the available data.

I can guarantee you anecdotally after reviewing thousands and thousands of cases that regular pot smokers have a LOT of extra head and neck cancers.

A lot of pot smokers also smoke tobacco - and probably engage in a number of other cancer-linked activities. (None of which is to say I'd be shocked if a pot-cancer link was established - but it hasn't been to date.)

[DiogenesLamp]

This is a typical instance where absence of evidence is not evidence of absence. THEY DON’T COLLECT INFORMATION ON POT SMOKING when information is gathered on every cancer patient in the nation. (Did you know that? —it’s mandated by law.) If the pot smoking is not listed via an ICD-9 code, the information is not recorded for the patient, as that would be considered a violation of their privacy, and as drug use, it is covered even more strictly by the medical record privacy laws. I can guarantee you anecdotally after reviewing thousands and thousands of cases that regular pot smokers have a LOT of extra head and neck cancers. We are, however, forbidden to gather that information.

Did not know that. It makes sense though. To hear the Libertarians tell it, Marijuana is God's gift to mankind and will bring us World Peace, heal the sick and revive the dead.