Chantix Felt a great responsibility to share my daughter's hellish experience while on this drug. My daughter is 33 years old. While taking Chantix she would at first laugh to herself frequently, went to anger and resentment to bizarre behavior and paranoia. She felt threatened that cameras where watching her in our home, phones were "bugged", heard demonic voices, lost her appetite, felt her life was threatened by an ex-boyfriend or the government. She became depressed and wanted to just die. She began to work part- days and went to missing days of work for she lived in complete fear. She also had panic attacks. After going off the drug for five days she virtually came back to us and is back to her pleasant and yes- smoking unconstipated self.