How to make flickering white spots and moving effects in After Effect
Stock footage. The spots and fast moving text are from old film leaders. When you are projecting film the first dozen feet or so is the "leader" it protects the inner film from dust and scratches, and lets you thread the projector. It often has the name of the reel written on it. That's what you're seeing over the video.

Prelinger film archive has plenty of old films with leaders, many of which are in the public domain. Composite one over your footage with the luma inverted, and adjust the brigtness / contrast and opacity until you get the look you want.

The "smoke" is probably ink in water. It's a common stock footage effect.