For the record I have not been alive 45 years. But long enough to know that what you just said is non-sense.
Just like your alcoholic remark...
Montgomery Scott was willing to take a derivative of a Klingon nerve gas "...it merely deadens certain nerve inputs to the brain" to mix with Scotch in The Tholian Web
. Scott was looking for a "higher-high", which is indicative of someone with a substance abuse problem.
This man was in charge of handling anti-matter which could cause the ship to go ka-blooey with a single misstep.
Somehow you've missed the fact that Star Trek: The Original Series
was full of flawed humans.