Light up, don't worry.

ISIS members who return to Canada from Syria and Iraq could have knowledge of chemical weapons and put it to use in a terrorist attack, according to internal government documents obtained by Global News.

The documents said the so-called Islamic State had repeatedly used chlorine and mustard gas in Syria and Iraq, raising the prospect of their use in Canada by returning foreign fighters.

No need to worry. Canada has common sense chemicals control.

The chances of a successful chemical weapons attack in Canada was considered extremely low due to “robust domestic controls” over the required materials and technology, the documents said.