It not a dangerous combo, except for the dosing jwh while on benzos part. For me (and a lot of other people) they turn off the part of the brain that says' This is a bad idea".
In my opinion,benzo's are great to take with synthetic cannabinoids.JWH compounds tend to cause anxiety,and fluttery feelings in the chest.Taking a benzo then waitinf for it to kick in,then do your jwh however way you want to.It should take away a good amount of anxiety,that is IF you get anxiety,and weird fluttery chest feelings.