Outside those two categories, caffeine is one of the most used mental stimulants in the world, and sold in forms emphasising this use.
Walk in to your doctors office and ask getting modafinil prescribed for improved work performance. What's the argument against it ? The ones I've heard are about them being there to treat conditions, etc. and giving stuff like this to boost performance of healthy individuals is very much a taboo.
I’m not even remotely qualified to so much as read and understand medical jargon, but even I can recognise that several items on this ([0]) long list of stuff that interferes with (or is interfered by) mondafil includes both food and stuff you can get without prescription from the new-age-hippie section of a supermarket. Given the dumb things my hippie mum gave me as a teenager (and my dad without telling him [1]), all I can say is that this seems to me to be unwise to make trivially available.
Perhaps I’m wrong. After all, the fact a random person like me can’t read and interpret the warnings like a professional would is as much a limit on how seriously to take my concern as it is a reason to be concerned.
[0] https://www.drugs.com/drug-interactions/modafinil-index.html
[1] at the very least Bach flower “remedies”, which would probably be harmless except for all the alcohol. She thought she was doing all of us a favour.
Well both have effects only as long as you keep taking them. If i recall correctly there's a whole lot of mind altering substances that are illegal because of that...
For me - there is no effect other than not feeling tired and being able to focus really well. It's not even feeling rested because physical aspects of fatigue still kick in (eg. back pain from sitting long, eye strain, etc.)
Caffeine is probably worse because I get hard withdrawals symptoms after I get off (light migraines first couple of days and generally tired) - I don't really notice anything different after taking modafinil and getting proper rest.
But how would you do if you took one every day?