[wcedmisten]

There's a case study [1] from the UK when they phased out "coal gas" which contained carbon monoxide, and which many people were using to painlessly kill themselves via their ovens (Silvia Plathe being the most famous to do so). The conclusion was that removing this method of suicide did decrease the suicide rates over that time period.

[1]: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC478945/

[tonyedgecombe]

Just putting paracetamol in small blister packs lowered the rate of overdose in the UK:

https://www.thelancet.com/journals/lancet/article/PIIS0140-6...