Even as a proponent of full legalization I know that as little as a few minutes spent in water can kill someone, and often does.
Why people are allowed to casually dive into this toxic substance is beyond me. No licenses, no regulations, practically any body of water you can find you're allowed to jump into totally unsupervised.
Most places don't even have signs warning people of the danger, and worst yet, many children practice a dangerous activity called 'swimming' in this substance often daring each other as to who can drop the highest from a rope into a potentially fatal body of water.
Also, once you start drinking it you need to find at least 4 litres of this a day to keep from going into water withdrawl, commonly known as dehydration, this can happen in as little as 3 days with out your daily fix.