Unless it's cooked, eating it won't do much at all. The chemicals need heat to activate, which is why cookies, brownies, pipes, bongs, etc are all used. I ate raw pot once too, and it was horrible, and didn't get me high at all. Keep smoking, you'll get high eventually. If you want to eat it, make cannabutter and make some cookies or brownies, don't eat it raw.

Also, you said you mixed it with tobacco and THEN ate it. Tobacco is really not meant to be eaten. If you eat enough commercial tobacco (like that in standard cigs), it will kill you, if you don't get sick and barf it up first.