TV
Smellin’ a lot of “if” comin’ off this plan.
— Jayne · Firefly

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The doubt here arrives as a smell, which is funnier than calmly calling a plan risky. The quoted 'if' is the whole complaint: too many things have to go right before it works. It's a blunt, earthy way of saying the plan leans on hopes instead of certainties.
Context reviewed