Thanks for your query
Its very unusual to have lung cancer
only after 1 year of smoking
I think you have lost your asthma
control after smoking.
Smoking affects asthma in the following way -
1. it is common trigger factor for asthma
2. it makes your asthma control difficult
3. it makes your respiratory tract
refractory to main asthma medication like inhaled corticosteroid
4. it increases the chance of asthma exacerbation
So it will be better if you immediately quit smoking.
You should have a chest x-ray PA view also.
You should consult your pulmonologist and get yourself examined. Smoking supplements if needed needs to be introduced. Asthma therapy may be stepped up to regain asthma control.