I'm having the same problem. At first i was only having nausea in the morning. Then, last week it switched to evenings. To top it all off, I was just prescribed an antibiotic that causes nausea. I can't deal with that double whammy, so I've stopped taking the Chantix. I'm nervous as h*ll, but I'm not giving up. I haven't taken it since Monday morning and I haven't smoked. The cravings are ridiculous, but I'm staying strong. Maybe after the antibiotic, I can talk to the doctor about resuming the Chantix. I really don't want to, but I'll do whatever to remain smoke-free.