Nicotine is not more addictive than heroin, in my opinion. Disclaimer: I’ve never tried heroin.
The CDC engages in “public health” campaigns all the time. It often publishes misleading facts and statistics, with the goal being to influence behaviors. The case of smoking in particular is enlightening, as the CDC has likely saved many lives by misrepresentation of smoking’s dangers.
Smoking kills. It often causes lung cancer. It usually causes more harm than good for most people. That doesn’t mean that the CDC is the most objective source for information on this topic.