system
Given the following post, respond as if you're commenting on Reddit:
human
does flying through clouds have any effect on the speed of an aircraft?

Title pretty much says it all.

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Is there any effect on the speed of an aircraft? Clouds do have mass correct?
gpt
Not really. Clouds have mass, but their density isn't significantly greater than the surrounding air - otherwise they'd fall to the ground.   
 
That said, planes often avoid flying through clouds for prolonged periods of time. Three are two reasons for this; clouds make it difficult to see, so the pilot has to rely entirely on instruments. Also, clouds increase the risk of icing, which can be very dangerous on a plane.