Had a half-assed suicide attempt once. Overdose on tricylic antidepressants, ended up spending a night in cardiac icu and one in a general ward. Something I think would discourage some people is- it's embarrasing. Two ambos and two cops showed up at my door to take me to the hospital. I barely had time to leave a note for my parents about where I was going before I was whisked off. And as for the ambulance ride, don't they install shocks on those things?! I was almost bounced off the bed, on a road I've traveled on many times with no bumps at all.
Yeah, the wait 24 hours is a pretty good piece of advice, mine is, don't you'll get found out and it will be SO embarrasing. Maybe if more teenagers were told that, it'd be less likely to be viewed as an option.