It depends on the state and severity of the asthma. I personally would recommend that you obtain advice from a combination of your regular treating practicioner and a qualified specialist diving doctor. I have known of cases of people who had been diagnosed as asthmatic but it was later revealed that they did not. Please look more into this as the question in itself is a minefield. the following site may help, but remember only your doctor and a diving doctor can really advise.
The Divers Alert Network has an excellent article about diving and asthma at

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