
I tend to use settings between about 6 and 9. Above 8 the flavour is stronger with a burnt tinge that often appeals to tobacco smokers. Presumably the grass would start to burn at Fahrenheit 451, the same temperature books burn at, and the vapouriser would become a pipe. My understanding is that vapourisation wouldn't occur much below about 6.
Apologies if you don't have a Volcano but, if you do, what setting do you use? Do you have any scientific perspective on what range should work best? How do you prefer the taste?