Agreed..... widespread use would be a total disaster..... look at the heroin use in China in the late 1800s to early 1900s pushed on the Chinese by the British.....
Or even legal heroin use here in the USA in the 1800s....
Both cases showcase nations almost destroyed by such heavily addictive drugs...
In 1895, Bayer marketed diacetylmorphine as an over-the-counter drug under the trademark name Heroin
-Wikipedia
You are apparently conflating heroin with opium (from which heroin is derived).
Regards,