Hmmmm. This is an interesting correlation. Perhaps people replaced the habit of smoking with the habit of eating toxic food? Which is worse… 

 Clearly I need to start smoking 🚬 

 can't cigarette smoking suppress appetite 😏 

 Swap out for pipe or cigar to leave out the nasty chemicals they put in cigarettes, and I'm down.

Next, do seed oils and obesity 

 Tobacco is a natural Ozempic.