I have used the smoke tube for cold or colder type smokes.
It works great for adding smoke flavor to things like homemade lox or cream cheese.
I don’t much care for the type of smoked salmon that is overly cooked so I will use the smoke tube to cold(ish) smoke the fish to what I call salmon candy.
This works well with sturgeon too.
I normally use an extra smoker and place the tube at the lowest point with a tray below a higher rack.
I will lay down the tube down at an angle in a pan or a smoke and sear (for elevation issues) if I’m using a kettle.
If I just had a gasser at my disposal I wouldn’t do it much different.
Maybe smoke using the tube for a bit.
When the flavor is what you want switch the cook style back to your regular gasser cook style.