It depends on the type of marketing those pictures were. Pictures used in anti-smoking campaigns were of the humans consuming them and the related health issues that ensued. They weren't of manufacturing cigarettes.

If you showed a bunch of in shape healthy people on low carb diets I'm not sure that would cause meat sales to decline.

If you mean slaughter, well maybe it would have an effect on sales, maybe it wouldn't. But it's not comparable to the anti-smoking ads.