That is really really stupid. I never talk to girls, and I would never make that my plan. That is just completely retarded.
Dude man... just ask her if she has a peice. If she says yes, ask if you can use it with her (If she asks why you might have a peice later just say you lent them to friends that day). If she says no just be like ok I'll just roll a joint/blunt, either one you could do better (i'd roll two joints), and ask her if she wants to smoke it. I've made many smoking friend just asking for papers of a pipe or something. OMG i just realized why my volume keeps getting muted! Everytime I press the spacebar my middle finger touches the mute button!