Modafinil has been in use for something like 30 years now, and has been taken on and off prescription by millions. Thus far, there are no reports of addiction, and just the usual rare nasty side-effects (which seems to be true of pretty much every drug in existence, and modafinil is better than most in having a really huge LD-50).
If you are going to scaremonger, then provide some studies.
It is also common sense that if you do something, and you do it a lot over a long time with a lot of people, and you don't see anything bad happening, nothing bad is probably going to happen!
Which is better, a universal weak probabilistic statement made in ignorance of specifics, or a narrow statement about one thing based on specific evidence?
> Also, many of these drugs take years for the effects to show up.
Again, provide numbers. I will grant that 'some' - as in, a non-zero number - drugs have long-term side-effects. However, I dispute 'many', or 'most'. There are many thousands of drugs which the FDA has approved, most of which do not turn up with horrible thalidomide-like long-term side-effects.
Caffeine is addictive and has strong withdrawal symptoms, unlike many nootropics