How to Make Spit Evaporate into a Cloud (Yes, It's a Real Thing)

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Find out why this viral trick works and wow your friends!

Co-authored by Elaine Heredia, BA

Last Updated: November 5, 2025 Fact Checked

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Evaporating Spit

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How It Works

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Are TikTokers really doing it?

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Video

In a recent trend, people on TikTok are claiming they can make their spit evaporate into a cloud out of their mouths. While some of them might actually be blowing vape smoke, making spit evaporate is a 100% real science trick! Read on to learn how to make a cloud of evaporated spit, step by step, plus learn why this works, scientifically. We'll also explore if TikTokers are doing it for real or faking it, and how the spit evaporation trend began. We promise, there's no smoke and mirrors here!

Can you make your spit evaporate?

Yes, it's possible to make your spit evaporate out of your mouth in a cloud. To do it, hold your lips closed with air in your mouth and click your tongue against the roof of your mouth for 30 seconds. Then hold your lips closed and pressurize your mouth. Finally, open your mouth to let the cloud out.

Section 1 of 3:

How to Make Your Spit Evaporate

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When you close your lips, make sure you have air inside your mouth. The air is essential for this trick to work! It also makes clicking your tongue easier.^{[1]
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This is called pressurizing your mouth. It's easy for your lips to pop open when you're trying to blow air through them, which is why you have to hold them closed with your fingers. "Blow" as hard as you can to make as much pressure as possible!^{[2]
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Open your lips and let the spit cloud float out of your mouth. Look in a mirror while you perform this last step. The cloud that comes out from between your lips may be easy to see, or so faint you can't detect it. This is a tough trick to hack, so don't feel bad if it takes several tries to see any results!
- To see the cloud more easily, hold something flat and dark gray or black in front of your mouth, like a piece of paper. The condensation shows up better against a dark background.

Section 2 of 3:

How Evaporating Your Spit Works

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When you click your tongue against the roof of your mouth, you create droplets of saliva. The warm environment inside your mouth causes the saliva to evaporate, or become water vapor.^{[3]
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As you pressurize your mouth, you're also increasing the temperature of the air inside. This causes your mouth to fill with even more water vapor.^{[4]
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Opening your mouth causes the vapor to condense. Finally, when you open your mouth, the decrease in pressure and temperature causes the vapor to condense, or turn into tiny water droplets. These droplets form a visible cloud—just like the clouds in the sky.^{[5]
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- Interested in more cloud science experiments? Check out our article about how to make a cloud in a bottle!

Section 3 of 3:

Are people on TikTok really evaporating their spit?

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Some TikTokers appear to evaporate their spit, while others might fake it. The TikTok user who started the spit evaporation trend, @justwhyguy_, appears to legitimately do the mouth cloud trick. In his first viral TikTok about spit evaporation, he opens his mouth and his hand while doing the trick to show he isn't holding any vape, cigarettes, or other smoking devices. With other users, like @.captain.m0rgan in this TikTok, it's hard to tell if they're really doing it because they start filming after their mouth is already closed.
- The spit evaporation trend began with @justwhyguy_'s viral TikTok. The video, posted on October 20, 2025, has generated over 15 million views to date!
- His second viral TikTok explaining how to evaporate your spit, posted on October 21, has generated 2.8 million views so far. These videos kicked off a trend of other TikTok users doing the trick (or pretending to do it).