Teenagers who dabble in drugs and alcohol are more likely to commit suicide. That's because alcohol (and some drugs) can mess up a teen's brain chemistry, causing him or her to become depressed. Likewise, alcohol can make an already depressed teen feel even more so.
Combine alcohol's penchant for triggering or enhancing depression with its ability to impair good decisions and you can see why it could stoke a smoldering fire. It's like dousing a forest in lighter fluid, discarding a lit cigarette and hoping for a good outcome. It just isn't going to happen. In fact a study that appeared in the journal "Pediatrics" showed that kids who began drinking as a pre-teen were three times more likely to attempt suicide than their non-drinking peers.