Can i have an asthma attack even if i am not asthmatic?

Possible: Asthma is quite a bit genetically predisposed however asthma not uncommonly affects people who have heavy exposure to a chemical or allergen in their occupation. The answer to your question possible but not probable.

Yes: The condition is called rads (reactive airways disease syndrome) and is triggered by a high dose irritant exposure (like inhaling chlorine). Symptoms are like asthma in a person who has not previously had asthma. Prognosis is typically good.

Rarely but possible: A local city pool had a malfunction in its chlorine insertion process that sent more than a dozen "non-asthmatic " people to the hospital with bronchospasm. They all cleared with treatment. Bronchospasm is a normal reflex that protects the sensitive lung tissue from such agents. Asthmatics just don't have enough balancing chemicals to reverse it when irritants are gone.