True enough, there are no new vices (at least, very few) under the sun.
Vices don't affect everyone equally, but few vices have no effect on society. Pot smoking has been considered harmless at times, but then became Public Enemy #1 (like in "Reefer Madness"). Pot used to be a "pulled drug" mostly for recreational purposes. It wasn't addictive enough to be "pushed". Heroin, on the other hand, was worth the dealer's time to push and hook, setting up long-term sales.
So was tobacco: Tobacco companies worked quite hard to get people to smoke cigarettes, men and women both. In tobacco's "peak year" 54% of the population smoked. It's down to 11% now. Why? Because the push of all-media advertising was halted; another reason, the indoor clean-air act which required smokers to go outside (not a law in all states). Once hooked, smokers can be coaxed from one brand to another -- as in, "I rather fight than switch" But many smokers did switch brands, periodically.
Smoking, whether tobacco, pot, meth, heroin, or whatever does affect society.
One would think that states would not want to engage in vice, but they do. One of the first state to do so was New York, when it launched a lottery to compete (and undermine) the numbers racket. Nevada legalized prostitution (as have a number of countries). Now the various state lotteries sell around $113 Billion worth of tickets. The global business is worth $361 Billion. States legalizing (not just decriminalizing) marijuana become pushers, because budgets always need more revenue, and tobacco taxes are not yielding all that much now but taxes in some states are very high to discourage tobacco smoking, often by the same states legalizing other smoked product. So for many people, pot has shifted from a pulled to a pushed product.
Another factor in pushing is the rotation of addictive drugs: fentanyl, heroin, meth, cocaine, alcohol, and others. Nobody asked for fentanyl to be added to heroin (or anything else), but in tiny amounts it added a kick, apparently. In more than tiny amounts is was the final kick one got. There is a core demand for heroin, meth, and cocaine, but quantities and purity vary a lot. I do not know how far up the supply chain it is that one drug suddenly becomes plentiful and cheaper for a period of time.
The relevance of pulling and pushing is how the state goes about controlling harmful substances (counting gambling as a 'substance' here). When it is both pusher and policer, I would predict tax revenue will trump arrest stats.
Another angle on pushing: One of the strategies of cutting down on overdose deaths and disease transmission connected to drug use is to open supervised shooting galleries where sterile equipment, dosage, and bad reactions can be properly managed on the spot. So far, no state has allowed cities to use this strategy (as far as I know). Some experiments have been tried. The state feels that safe shooting galleries cross the line from public health to pushing drugs. [Safe sites do not supply the drugs, and they do not offer introductory doses for non-addicts.) But the state that says no dice on safe shooting galleries may, at the same time, be degrading lives by promoting gambling and promoting "socially acceptable" drugs like alcohol and cannabis.