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Biological realism of movie scenes megathread?


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https://www.youtube.com/watch?v=HuYeQi4wB_k#t=2m40s

 

So I was recently thinking about this Cheech and Chong scene in which the characters smoke a joint in which cannabis is mixed with dog feces, presumably because the screenwriters were going for cheap shock value. In real life, though, wouldn't this risk causing them to inhale aerosolized fecal matter, and in turn, causing them to inhale all the pathogens contained within it? Or would the heat from the flames kill the pathogens on their way into the individual's lungs? Even if this kills the pathogens, would this still risk causing inhalation of non-trivial amounts of hydrogen sulfide and/or methane? (Disclaimer: For the record, I do not intend to attempt this and I would not recommend anyone else attempt this, because eww, let alone possible safety concerns.)

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Unless the defecating animal is sick, then their feces is unlikely to harm the person ingesting it. It’s mostly water, harmless bacteria, undigested food, and some dead cells. 
 

 

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13 hours ago, iNow said:

Unless the defecating animal is sick, then their feces is unlikely to harm the person ingesting it. It’s mostly water, harmless bacteria, undigested food, and some dead cells. 
 

 

Ah. So there's a chance that the bacteria inhaled are harmless? So the characters could've gotten sick if the dog were an asymptomatic carrier to a dangerous pathogen, but it also makes sense that if the dog were healthy enough, the bacteria involved were harmless enough for the characters involved not to gave gotten sick?

 

Am I to assume then that the issue of hydrogen sulfide/methane inhalation issue is a negligible one?

 

(Again, I want to be as clear as possible that I do not intend to try this kind of "mixed joint" either way.)

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50 minutes ago, ScienceNostalgia101 said:

Ah. So there's a chance that the bacteria inhaled are harmless?

Not just a chance, but a high likelihood. 

 

51 minutes ago, ScienceNostalgia101 said:

Am I to assume then that the issue of hydrogen sulfide/methane inhalation issue is a negligible one?

Depends on intensity and duration of exposure 

Also, this isn’t a megathread. That was a bit presumptuous 😂 

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I love the notion that old Cheech and Chong movies can generate science threads of any size! 

I think the answers lie in determining a broader question:  what are the combustion products (aside from CO, NO2, CO2 and volatiles) of dog poop?  I'm leaving aside the bacteria question, as I think it's reasonable to assume that they don't survive incineration very well.  Your biggest concern would probably be the PM, which could be highly oxidizing in the lungs.  Check with studies of biomass burning done in the homes of developing nations?  Dung cakes are often used, along with other agricultural waste.  If there were a lot of PM10 or PM 2.5, that could be the real threat to your hapless movie stoners. 

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