Might explain why I can barely gain weight, once had a camp week where me and a friend had the exact same food intake and exercise but he gained 2kg while I lost 3kg.
Sofar doctors have thought I just had a fast metabolism but seems like there could be more at play.
Don't think I've seen one of my friends actually quit yet, but vaping has replaced cigarettes for 90% of the usage.
So it really depends if you think vaping is less harmful than smoking.