Nicotine by itself isn't really that bad, as it isn't much of a carcinogen. The sharp increase of nicotine in vapes is troubling though, as although it isn't much of a carcinogen, it does increase risk of heart disease and can lead to hardening of the heart in the long run.
FOSS is also important too. It means free and open source software. https://www.wikipedia.org/wiki/Free_and_open-source_software
Free in this case means something different, I'd recommend a read up on it too https://www.wikipedia.org/wiki/Free_software