I would highly suggest picking up some banisteriopsis caapi leaves from an online vendor. Also acquire some mullein from your local forest, herb shop, or wherever.
The caapi leaves are an excellent synergystic choice. While the mullein is very absorbent of spice. It also has healing effects on the respiratory system when smoked in small quantities, so it works out well for this purpose indeed.
If you want to get fancy you can add a pinch of salvia apiana (white sage) and a bit of lavender. These 4 combined are my favorite. I would do a ratio of 40:40:10:10 Caapi/Mullein/Sage/Lavender or something like that. I never weighed, always improvised.
Enjoy! Don't use hookah tobacco!!!
And remember always make your changa 1:1 herbs to spice or stronger