I cold smoke using a pellet tube (appears the same as yours) and I don't get that much smoke. Yes, I get that much cloud after lifting
the kettle cover, but it goes away.
I don't make dust from the pellets. Search dust and you will find the methods people use to wet and pulverize the pellets into a granular dust.
I do crush so there is more pellets and less air in the tube. Slows the burn and I close the bottom vents by 1/3 and the top vent by 1/4
My cold smokes are under 50° F or 10° C
You're in Columbia and in the summer season. What is your temperature?