Think of drugs as a risk vs reward system.
So:
1. Weed
--A: Is trying weed likely to mess your life up? I guess it's possible but it's EXTREMELY unlikely.
--B: Is trying weed going to make your life better? Probably not, but it's possible.
Verdict: Almost certainly no harm in trying it. If you have pain or something that it can help with it's probably better than the alternatives. If you end up "addicted" somehow it's unlikely (not saying it's impossible, everything has some risk) to mess your life up permanently.
2. LSD
--A. Is trying LSD going to somehow mess your life up? Doubtful. And it's really, really, unlikely you could turn into some sort of LSD addict--it's probably impossible, or closer to impossible than becoming addicted to just about anything else in life (not drugs, I mean anything).
--B Is trying LSD going to make your life better? Possibly.
Verdict: worth doing it, just get the setting right
3. Meth
--A: Is trying meth going to mess your life up? While it might not be likely (as in >50% chance), it's certainly COMMON that it could.
--B: Is trying meth going to make your life any better? No. That's pretty much a flat out no, no chance. If you have real ADD go to a doctor and get the appropriate meds, otherwise, no way.
Verdict: Risk vs reward totally fails here. Why would you risk it?
We can use the same system for legal drugs.
1. Caffeine
--A: Is trying caffeine going to mess your life up? No.
--B: Is trying caffeine going to make your life better? Probably not, but maybe.
So, verdict: drinking your coffee is probably fine.
2. Cigarettes
--A: Is trying them going to mess your life up? Maybe--long term will probably cause big health issues.
--B: Is trying them going to make your life better? No (unless you work in an office and magically get more breaks as a smoker, I guess).
Verdict: no.
So no, don't try meth, there's simply no point. If you want to try more drugs, why not try more/different psychedelics in the right setting? Get some mushrooms or something.
