A 2009 study found that combining tobacco and cannabis created more available THC. This means that you’ll feel the effects of cannabis very quickly, and more of it will be available for your body to use.

The study examined the THC content in smoke captured from a pure cannabis joint and a spliff containing only 25% cannabis. The results are surprising. THC in the smoke from the pure cannabis joint measured around 32.70 milligrams per gram. And the spliff? THC increased to 58.90 milligrams per gram. This lead the study authors to conclude that tobacco seemed to increase the vaporization efficiency of THC by as much as 45%.

This lead the study authors to conclude that tobacco seemed to increase the vaporization efficiency of THC by as much as 45%.