I think to control using hard drugs like meth you would have to have some sort of dosing regimen, like one oral dose in the morning, get all your shit done and benzo to sleep at night. With vaping it you've no chance in my experience, you just accept its a hedonistic session and enjoy it. It's a good buzz, but ultimately very bad for you especially with sustained (ab)use. packet_sniffers advice is good. I also found seroquel after meth killed the buzz a bit which suggests it would probably help if your going mad.