yes because it contains chemicals that are harmful to our body
No but it is flamable.
Yes, nitrogen dioxide is harmful. It is a pollutant which is toxic if inhaled.
if it is inhaled or digested yes
Marijuana is harmful when inhaled. No matter what you are lighting it with.
Yes, and so is touching it.
It's harmful if swallowed or inhaled. It may cause irritation to the skin, eyes and such.
Yellow paint can be harmful because of the chemicals or dyes that are used to create the yellow coloring. Yellow paint is not any more harmful than other colors of paint with the same types of chemicals.
They inhale the same poisons that the smoker inhaled and exhaled.
It is not unstable, used properly it is safe. But of course it is harmful if inhaled.
The inhalation of citric acid powders is undesirable.
Synthetic elements might be harmful if they are ingested or inhaled. The elements can cause damage to the lungs, brains, and heart.
If significant amounts are inhaled or ingested then, most definitely, yes.