Ive had asthma since i was 2, had a few bad attacks when i was growing up and during my mid/late teens depended heavily on ventolin, then when i turned 20 i thought i'll go and see what can be done before i became immune or something, i was put on Seretide 250 twice a day which drastically reduced my symptoms and the last time i went for my 6 monthly check up i got put onto the 100 dose, i have only used 2 ventolin's in the last 8 months, bearing in mind i used one a month before, so it's definetly worth sticking to.
Ps, Always clean your teeth and mouth wash after taking it cos it rots them to fook and gives you bad heart burn if you don't.