Is the charcoal burning method reliable?

I’m reading about how it’s the second most popular method in Hong Kong.  Right after jumping.  Here’s a study.  http://bjp.rcpsych.org/content/186/1/67.full

I think I’m gonna go for it.

*Note: I’m not condoning suicide or this particular method I’m just curious if it’s worth trying.  I don’t want to fuck something up like suicide.  This is for harm reduction purposes.