Firstly don't panic, top up your oil level to the Max mark on the dipstick on level ground after the engine has been off for a while to make sure all the oil has run back down to the sump. Take note of your km reading
Check it again in a week and see if it has gone down and how many ks you have done, a 12 yr old car is going to have some wear and will use some oil, as a rule of thumb high to low mark on the dipstick will be about one litre.
Piston rings are only replaceable after a total strip down, so major.
Try and take note of the colour of the smoke, blue is definitely burnt oil meaning either rings or valve guide wear letting oil into combustion chamber, black is more likely poorly burnt fuel, mixture or something amiss in the fuel injection system. I live with blue smoke and I think I would miss it if I did not have it, a good dose of burnt oil in the morning is better than coffee to get you going