welcome to the forum new member.
please check out my blog, its got all the info a new member could want.
you can access it by clicking my user name & selecting blog.
as for nicotine being harmless/full.... It is very similar to caffeine.
anything in excess can be harmful.
it is up to the addict to find the best rout to suppress the negatives.
that is what you are. an addict. a chronic user of a drug.
a drug is anything that effects the central nervous system.
as for what to get... what are you looking for? there are many options,
all of your options are highlighted in my blog.
there are cig-alikes, small mods, and big battery mods.
cig-alikes attempt to replicate the look of a cigarette. They suffer from low power and low battery life.
small mods are the size of sharpies or butter knives. Better battery life, medium power.
big battery mods will satisfy you in every way if you know how to use them correctly. but they are big, & bulky.
there is a trade off in every category.
Please ask your questions here in this thread, search and look around the forum, my blog, and feel free to PM me.