3 What are the warning signs for the main groups of hazardous substances defined by the classification packaging and labelling of dangerous substances regulations?

the seven main groups are: Harmful, Irritant, corrosive, Extremely flammable/Flammable, Explosive, Oxidising and Very toxic/Toxic.

There is no difference. They both mean the same.

tobacco the white thing and the smoke

the classification of substance is only ELEMENT.

That will depend on the hazard of the substance- flammable, toxic, explosive, radiactive? It will need to be stored in a manner that it is secure, and separated from the conditions that would...