ya gotta build up a little in your system before it will really effect you.
try this
take a few "3+" tokes without holding them in just to get the chemical "Salvinorin" in you
a half hour later do it the right way which is....
pack big 1 hitters and torch them hard "torch lighter not needed" till yer lungs are full
hold in for at least 20 seconds
let out and hit again right away with fresh salvia
do this at least 3 times

also I find the plain leaf works just fine after the chem is in your system