Best (and safest) way to setup a cooldown mechanic to script?

[LeeTheCoder]

I've got an addon that heals a player, simple as that. The thing is, I don't want players to be able to spam use on the prop that activates the healing.
I'm assuming I'd have to do something with [img]http://wiki.garrysmod.com/favicon.ico[/img] [url=http://wiki.garrysmod.com/page/os/time]os.time[/url]. Is there any downside to using this?

[Bull29]

Use CurTime for best results; something along these lines

local NextUse = CurTime()

if NextUse <= CurTime() then
     NextUse = CurTime() + 2
     ...
end

The number is in seconds, works precise for general use, even going as far as hundredths