Common factor: Money to be made.
Tobacco was the core of many states' economies, and still remains a massive industry which makes many people wealthy.
Dealing with CO2 emissions would have required dealing with fossil fuel use... and that's tons of money and power in play there.
Sugar is, at the very least, another substance people crave, and has been making people rich for hundreds of years.
Delaying tactics are feasible when you have billions or trillions of dollars, control regulatory bodies, own politicians, scientists, and armies of lawyers. Delaying tactics on the orders of just a few decades means generations of VP's and C-levels getting unfathomably rich, as well as key shareholders. So... fuck the harm, delay, delay, delay.
The key is that you have to not give a shit about anyone other than yourself, or be genuinely deluded.