Youth are then urn randomized to receive either one individual session of Motivational Interviewing (MI) or Relaxation Therapy (RT). To optimize our chances of establishing a causal relationship between the treatment conditions and differential treatment outcome urn randomization is be employed. For our purposes age (<16 vs. > 16),family history of smoking (none vs. first degree biological relatives), and childhood onset conduct disorder with aggressive symptoms (yes vs. no) will factor into the urn randomization procedure, making it more likely that groups will balance on these variables.