This is exactly why we need
factual drug education prudent age restrictions where legal (drinking age = smoking age), and the normalization of affordable psychiatric checkups and basic information about mental health.
Factual drug information would include these warnings, plus giving lots of folks information about what to do if it should happen. Prudent age limits - ones that can be enforced reasonably - help folks know themselves a bit more before they try it out. Psychiatric care being normal can help catch a few folks along the way, and knowing what to do (per the drug education) hopefully means more folks get help.
It won't stop the "I am fine, it won't happen to me" sort of thinking, but this sort of thing can prevent a bit of it and change the outcome of it.