Harm Reduction

The pharmacokinetics of ethanol and THC differ quite a bit. From a metabolic point of view, despite how some feel the “morning after,” ethanol has a short half-life of 1 to 2 hours.
Three years after its first‐​in‐​the‐​nation drug  decriminalization measure (Measure 110) went into effect, Oregon’s lawmakers are 
“The key question is whether waste is produced more or less efficiently as systems scale up, and how big a recycling burden there is as a consequence.”
“We have very clear evidence that, though not risk free, nicotine e-cigarettes are substantially less harmful than smoking.”  
The UK has a long history with alcohol, as the phrase gin mill might attest.
The study, conducted across 29 academic medical centers, looked at patients who were transferred to the ICU or had died 24 hours or later after hospitalization for a medical illness.
This protocol has worked well for some pollutants, for which concentrations are now well within standards: