So here's what I did this year and it worked out pretty good. Note i live in us so if you live elsewere this may not b an option. I got a pound of cheap legal hemp flower from an online wholesaler for 400$ and use it as filler flower in between the good stuff of to occasionally mix it in to make good stuff last longer. Its lasted me 6 months got it beginning of summer and on the final maybe 10g. I am a heavy smoker.
Then I got my first dry herb vape. Dry herb vapes are definitely the most cost effective way to smoke, the smokes a lot cleaner, taste a lot better, and sessions last a lot longer. Its nice to be able to dial in on your preferred temp range. But nothing is quite like a hard combustion hit. Sometimes I indulge a good bong hit still even if its not the most cost effective .