Cellfood, l-citrulline, and chantix. can i take these at the same time?

Yes: I'm very glad you are undertaking to quit smoking. Don't expect either of the other two concoctions to affect your health or well-being either for better or worse. I have found no credible health claims for citrulline, and the ads for the other concoction include statements that any person who knows basic bioscience will recognize as obviously untrue. It's your money.