Yeah, but seriously, do you know how much you need to drink in order to overdose on water? I drink 6 liters a day (3x the recommended amount) and I have never overdosed on water. The only time anyone has died solely because of drinking to much water is a woman who was in a water drinking contest in which they forbid contestants from using the bathroom. That's the key, if you can go to the bathroom than water overdosing will become nearly impossible without some further complication that you cannot help. The body will immediately direct water to the bladder if no water is needed.
Also, the only way you can over-dose on oxygen is to pump more than 20% oxygen into a room and then light a match. I don't think that counts, because than I could say you can over-dose on methane by turning the stove on and than lighting a match 30 minutes later. Or if you are diving underwater, or if you are in a mechanical lung. None of these are comparable to overdosing on alcohol/drugs.
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I agree, that everything you listed (save water and the oxygen) can be self-destructive.
However:
What are more than 75% of domestic dispute calls the cause of? Alcohol.
What is the most abused substance in the United States? Alcohol.
Which substance fuels the majority of passion-crimes (rape and murder, almost always to a significant other)? Alcohol.
Which substance kills the most people every year in the United States? Alcohol.
I don't care if people drink alcohol. But it's not right to lessen it's influence and destruction because I don't mind people who drink. Alcohol can be a very dangerous substance, much more dangerous than any schedule I controlled substance.