Seeing how all the effects of smoking weed are "non-toxic", I don't think they are interracting directly. Your stuff is supposed to make you drowsy, right? And impotent?

One side effect is nausea and weed destroys intruders in your stomach. Your stuff will also give you dry-mouth, so I suppose your mouth will be pretty comfortable (for me to have a seat on so I don't sit on anything wet).

But, I guess having a powerful drug, like Paroxycane or whatever, for two years, will screw you up having other drugs, like marijuana, interract with them.