Lol yeah, I'll definitely use drugs in the future
Nice work!
Suggestion: Add a title page
so change

<title>repl.it</title>

to

<title>Safe trips</title>

or whatever

Also,

<center>

is deprecated
instead, remove it and in your css add

body, html {
  text-align:center;
}

and so on. View the docs

Great work!

while(true){
  bigBrain ++;
  ++ safeDrugs;
}