About Smoke 

• On first time use, the soldering iron may produce smoke, this is because the mica are natural mineral, it has impurity inside,
• when the impurity burns, there is smoke coming out,
• It is normal and should only last for approx. 10-30 minutes. the smoke may be not pleasant, 
• but It is not harmful to the product or user.  from next time use, there will be no more smoke,