When I started smoking, I would get them wherever I could find them, so they were free. When I started buying them, they were $0.90/pack for any of the Marlboro varieties. The last packs that I bought (after I stopped buying them by the carton) were upwards of $7.00/pack.
When I started buying them by the carton, they were $8.50-$9.00/carton. When I stopped buying them by the carton, they were almost $60.00. Yeesh...
On a side note, my wife and I went to NYC last year, and I was absolutely shocked to see that a carton of Marlboro reds (my smoke of choice) was over $100 in the East Village.