(I don't smoke btw, but my father-in-law smokes like a chimney)

Its hard to relate cause and effects, but I see a noticeable decline in smoking among younger people, and smoking has become very uncool. People will also make a big deal about second hand smoke, for instance if you're near a bus stop or busy sidewalk you may get called out.

I don't know if anything besides medical intervention can stop a seasoned veteran smoker, though. Packaging certainly hasn't had any effect on my few family members that smoke.