Some people still need some willpower to switch from smoking to vaping, as there are loads of other addictive compounds in tobacco beyond nicotine. Some do it easily.
The Pockex is a good starter set and widely available.
I smoked for 28 years and have now been vaping for nearly 4 years. My dentist can no longer tell that I ever smoked, which is a good sign as smoking is very harmful to gums.
All the credible evidence suggests that vaping is safer than smoking, but it varies on how harmful vaping is alone. A lot of people both smoke and vape which can skew data. Micheal Mosley did an excellent documentary on it.
Popcorn lung has been well and truly debunked, there's more of the linked compounds in tobacco and I don't think any smokers have ever had popcorn lung. I certainly never heard of it in my 28 years smoking.