Not for smoking. Only for smuggling a shockingly low amount of 0.5 kg. Locals don’t get too upset when poor foreigners get executed.
If you’re caught smoking (citizens can be tested at the airport and a positive result is a possession charge) you’ll likely have to serve a 3-6 month detention at a drug treatment facility and so drug tests for the next 2-3 years.
If clean, you’ll be stuck with a criminal record for the rest of your life which will significantly minimize your career options.
If busted again using, you’ll get repeated higher and higher prison terms measured in years.
No, this is mostly the story of a small local airport that was dingy becoming more modern and airy. But it has nowhere near the traffic, amenities, or experience of Changi.