I know this won't mitigate or excuse it for some, but I was FAR more certain of my products purity than of any of the filthy street drugs I've put in my veins over the years.
I feel far better putting a known dose directly into my bloodstream than going through the anxiety of having to smoke it and not knowing if I'll get the intended dose in time. For ME, it's the preferred ROA. It makes me feel at ease and comfortable with what I'm going to do and certain of the dose. And hey, my lungs don't ache from inhaling the vapors. I certainly wouldn't advise anyone else to do this, and I am definitely not advocating it.
Was this guy's marijuana water made with extracted alkaloids or simply boiled plant matter? What steps toward 'safety' did he take?