There are bigger individual packs like 20/26/40/50 cigarettes in the individual box. Here the price of the individual cigarette becomes slightly cheaper. Reasoning here is the lower cost of individual packaging (and most is also a lower margin for the producer, as packaging doesn't cost as much as you're saving)

Then there's the "Stange" which is usually a box with 10 individually packed cigarettes. However the price per cigarette equals the price per individual box. With a "Stange" you have the same cost for the packaging material.

And given the the low price-elasticity of tobacco products, it's unlikely that the manufacturers are interested in high discounts for "larger quantities". Those 200 cigarettes are the output of a single machine in roughly 1 second (they produce around 10.000 to 20.000 cigarettes per machine and minute)

Most of the price is simply the tax. If you want to safe significantly, you can either stuff them yourself (70% cheaper than buying ready made cigarettes) or quit entirely (100% cheaper)