I'd also add that the white/blue smoke can sometimes vary based on smoker and outside temp.
For instance, I have a BWS (water smoker) ... when it goes under 45-50* it starts looking like an old coal train puffin it's way up a mountain from all the moisture within the smoke itself. But on a hot summer night, one barely sees anything coming out.
Country Smokers 450
Weber Smokey Mountain 18"
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