Requested Repost 2Nov2011 WINSTON-SALEM, N.C. The poor safety profile of the smoking-cessation drug varenicline (Chantix™) makes it unsuitable for first-line use, according to a study published in the Nov. 2 edition of the journal PLoS One, an online publication of the Public Library of Science. Varenicline, which already carries a "black box warning" from…