Singapore actually does drug tests on random Singaporeans returning from holidays to enforce exactly that.
"No weed for me thanks, I don't wanna take any chances. I'll stick to the cocaine tonight"
"Custom officers can subject travellers to a drug screening test at the point of entry to Singapore. If you test positive for drugs, you can be arrested and prosecuted, even if the drugs were consumed prior to your arrival in the country."
That's insanity.
There are billions of people who would love to live there.
Now we're back in the states we hit the vape quite often but didn't need it in SG. No place has everything.