I have no idea whether this is advisable for smokers or not... but this is what i do know:
Ibuprofen and CoQ10 is used by porn stars sometimes for raging hard-ons and athletic endurance instead of the obvious...
I think about 200-600mg of Ibuprofen is sufficient per day... its best to take it with food so it's easier on the stomach.
CoQ10 is found at health food stores. Most often in Canada it is in a mixture with other blood oxygen transport complexes... White Blood is a good source.
the CoQ10 should be taken 30-45 minutes prior to a session as it hits the blood quickly and diminishes after 2 hours or so.
personally, i'd try the combo for a few days 1st to see how it works... practice with your hand and some porn??? whatever works.
unlike viagra, you're not gonna just get it up 'cause you got this in your system... take it like it's a vitamin and the rest has to work 'upstairs'... it's all mental, bud.