Wax is made by extracting cannabis plant matter with liquid butane. You better know what you are doing playing with butane!
The butane is separated by water and ice.
There is no real detectable amount in the finished product...
There’s a special on Nightline about the stuff where they are ooing and awwing all over it with people entering into a contest to see who can make the best product”. If you think the stuff is harmless take a look at the people making and smoking it. Speaks for itself...