this is false
the last few decades of ultra moralistic biased research failed to account for the hundreds of other chemicals ingested by niccotine users
nicotine is NOT addictive on its own
"Nicotine is known as the drug that is responsible for the addicted behaviour of tobacco users, but it has poor reinforcing effects when administered alone. "
https://tobaccocontrol.bmj.com/content/25/4/444 

 Im not a researcher, just an addict, but i find refined and purified nicotine to be extremely addicting.