If you take one thing from this page, take this. Strength is the nicotine punch, the physical power of the cigar, the part you feel in your body as a buzz, a head rush, or, if you push too far, a queasy stomach. Body is the weight and intensity of the flavor on your palate, how full and loud the taste is, the part you notice in your mouth and nothing to do with how hard you get hit. Strength runs mild to full. Body runs light to full-bodied. They are measured on different dials, and the words just happen to overlap.
They do tend to track together, which is why the mix-up is so easy. A lot of full-strength cigars are also full-bodied, and a lot of mild ones taste light too, so most of the time you can use the strength label as a loose stand-in for both and not get burned. The trouble starts at the edges, where the two dials are set differently, and that is where the labels lie to you.
Here is what that feels like in practice. A creamy Connecticut-wrapped cigar can be packed with flavor, all that sweet cedar and toasted-bread richness filling your mouth, while the nicotine barely registers, so it reads almost full-bodied yet smokes mild. That is a flavorful but gentle cigar, and beginners love it for exactly that reason. The opposite happens too. A cigar can knock you sideways on nicotine while tasting fairly plain and one-note, plenty of strength but not much body. So next time someone hands you a cigar and calls it full-bodied, the honest question back is whether they mean it tastes big or hits hard, because they are not the same claim, and a careful smoker keeps the two apart.