I have tried chantix but it makes me nauseated anyone else having any bad side effects?

I have finally quit smoking but I tried the chantix but the nausea and the vivid dreams kept me from taking the pill so I quit on my on,but sometimes I have cravings for the cig and I will take the pill and deal with the nausea just so I want smoke,I just wonder what makes me have nausea everytime.