side effects of Dramamine II

My question has to do with side effects and Dramamine. On two different occations I got dizzy and nauseadated after taking dramanine and being in a small area with cigarette smoke. Is this a common side effect? Could it be a reaction to the smoke? The only other thing similar on these two occastions is that I had taken Dramamine for more than a coulpe of days in a row since we were traveling by train, bus, or boat every day of our European trips. Could I have over dosed on Dramamine? I did have visual loss with a motion sickness patch I used on a cruise once.

Hopefully you can answer my question.

Thanks, 

Terri