have AHK script stop on hotkey

I have written an AHK script to hold down Ctrl and left click, that works.

However I want the loop to terminate when I press F1 again, that doesnt work, maybe holding Ctrl messes with that?

toggle := !toggle  ;toggle on off
tooltip % "AutoClicker: " (toggle ? "ACTIVE" : "OFF")
settimer,tooltipoff,1000
return

tooltipoff:
settimer,tooltipoff,off ;turn the timer off
tooltip ;clear the tooltip
return

f2::
t=0
    While (t<7500) {
send {Ctrl down}
Random, I , 105, 126
t+=I      
Click
Sleep I  ;  milliseconds
    }
    send {Ctrl down}
    sleep 100
    send {Ctrl up}
    sleep 100
    send  {Ctrl}
    tooltip % "AutoClicker: " ("OFF")
    settimer,tooltipoff,1000 ;set a timer for 1 second to clear the tooltip
return

#if ;reset condition so all hotkeys work if posted under here