Nothing was ever propping smoking up. We've been smoking for literally thousands of years, long before any notion of formal marketing. Nor was it killed by some sort of marketing campaign. A large part of what happened was we had a generation grow up with ubiquitous electronic devices. You see a cascade of similar social effects such as declines in teen pregnancy, declines in violence, and a wide array of other phenomena all on the same timeframe (also alongside declines in fertility, testosterone, increases in obesity, increases in mental illness, etc).
You can even see this phenomena in practice by looking at the reverse -- quite a handy tool for measuring the soundness of an argument. In many parts of the developing world there have been similar bans on advertising and you also have plain-packaged cigarette cases with absolutely disgusting examples of what can happen if you smoke, such as people with facial disfigurations from oral cancer. Some countries have even seen extremes such as cigarettes being literally blurred out on television and push back against media that contains such to begin with. But again, negligible effects. Large part of the reason being nothing's replaced it as a past time. Bring in the zombifying pale glow of our digital screens and it'll get dropped like a bad habit.
Another counter-example to this would be things such as 'D.A.R.E.' It was a decades long well funded government program that tried to reduce drug usage through 'marketing.' It ended up having a paradoxical effect and increased various forms of drug usage.