The underground culture of illegal street racing is alive and well though.
Cycling is not a social activity in the sense that has constraints to socialization both during the activity as well as before/after.
Street racing isn't that social of an activity either but it exists and thriving. The Fast saga made 15B from it. Drug consumption on a night out is the social activity by definition, it trumps street racing.
Street racing has an element of thrill and danger in the race itself, whereas pot only trill would be breaking the law given that it is impossible to OD and there is little to no harm.
The low toxicity and low harm are positives but only as long as there is some form of thrill to keep the population hooked on pot. That is: breaking the law.
People are not smoking pot as a trill of breaking the law. Just as drinking alcohol before the age of 21 is not for the trill of breaking the law, but for the feeling it gives.
Alcohol is in every way worse for you as a person and for society, yet it is fully legal.
I don't smoke simply because my Job requires a pot free lifestyle. But I spent the first half of my 20s doing it, and the last thing on my mind or anyone else was "Take that LawMan".
Plus you can be a daily smoker for 6+ years and quit cold turkey. Sure you might crave it, but that is more mental. Your body doesn't break down from not having it. Unless you have poor mental control to keep yourself from breaking. Its the same weak control that fools people into dumping money into mobile games.
It's not because of the thill. It's because people like to relax or focus. There are two different main strains and both do different things, one is more relaxing the other is more energizing.
Which is anecdotal, but still more grounded in reality than wild conjecture based on nothing.