Chew on this... beyond the profit made on Alcohol and Cigarettes... think about what's made on junk food.
If you take a moment to 'look' at junk food and what's redily available for the uneducated consumer, you'll see something obvious. Profit! Let's look at fast food. It's usually fried or a burger or both. It usually comes with a softdrink. They normally ask you if you want to BIGGIE size it. And it's almost FREE.
Now consider what's in that nearly-free meal. Carbs, sugars, trans-fats, cholesterol (LDL's),etc. Think about the empty calories in that meal. Think about the processing involved to get it that way. Ack! I like to make this joke when I used to go to fast food places...
Fast food guy: " can I help you sir? "
Me: "sure, give me a number 4 with coke please".
FFG: " would you like cheese? "
Me: "sure".
FFG: " would you like to upsize your order for .25 more?"
Me: "sure".
FFG: "is there anything else?"
Me: "yeah, I'd like a side order of paddles with that #4!"
** Half the time they don't get it. Paddles refer to the gizmo (defibrillator) that re-starts your heart when you have a heart attack!
**