Without details it’s impossible to know what you’re talking about, but it should be noted that the early phases of using stimulants or abuse-pattern usage (e.g. doubling doses before doing something, or even taking cocaine or other recreational drugs) is well-known to be associated with a heightened sense of confidence.
This doesn’t work forever (tolerance) and other people will experience the opposite effect with heightened anxiety.
If you want an example of why it’s not a blanket true statement or an easy solution for fear extinction, consider that stimulant use at excess dosages or abuse-pattern usage frequently ends in paranoia, where users are in such deep fear that they start sensing danger everywhere.
This doesn’t work forever (tolerance) and other people will experience the opposite effect with heightened anxiety.
If you want an example of why it’s not a blanket true statement or an easy solution for fear extinction, consider that stimulant use at excess dosages or abuse-pattern usage frequently ends in paranoia, where users are in such deep fear that they start sensing danger everywhere.