Haven't eaten pork, but have seen pigs run.
Tong Dan, who frequently attends various parties, has certainly encountered marijuana before.
Once material life is abundant, people often seek mental stimulation.
And drugs are the most convenient means for that.
As the "basic model" in drugs, marijuana is favored by some rich kids due to its portability and circulation; it's wrapped in rolling paper and looks almost indistinguishable from cigarettes.
Of course, Tong Dan always avoided it. She loves to have fun, but she's not naive enough to try everything. She's seen much of the pathological behavior that follows marijuana use.
After all, they're friends and colleagues, so after she yielded, the strong men released Tong Dan and Pan Yang.
While many countries have declared marijuana legal internationally, Dongying is not among them. Consuming drugs in public, do they think no one would recognize them?
Tong Dan certainly doesn't think so.
Just like she saw back home.