Ok. It is upsetting to see smoke billowing out of your stuff. However, how worrying the problem is, depends on what kind of smoke.
1. Blue Smoke: if the smoke is blue, it is usually laquer used by the manufacturers. it will burn off after around 10 minutes. This is mainly going to occur on machines the first time you use them.
2. White Smoke: This can be due to an excess of oil in the tank. This will gradually burn off.
3. Black Smoke: This can often be caused by a dirty carburettor. (if the machine has been used with full choke or perhaps tipped or excess oil has been burned off) Check and clean.