Tobacco is a hallucinogen. Guess you've never tried Rustica. It'd take you about 3-4 packs of American cigarettes (all chain smoked) to feel any kind of hallucinogenic effects.
If we're going by the definition of seeing things that aren't there for hallucinogens, I don't see how tobacco could possibly make you hallucinate.
But I think if you did get some effects off of tobacco it would be because of the adverse health effects and the sheer quantity of smoke. Being lightheaded enough might make you see things strangely, but I could smoke straight paper and get the same effect after a while.
However, nicotine itself is defined as a stimulant.
http://en.wikipedia.org/wiki/Nicotine