Weight control and asthma flare up, any connection?

i'm starting to feel a lot better and glad i'm just on two inhalers and Damn strong antihistamines. now that i'm feeling better i'm thinking about serious prevention. i'm desperate to regain my control over asthma but wondered is there a connection to weight gains and flare up's? i've got no idea what my trigger is and think that would help me over come my little phobia of a massive asthma attack (i only get massive ones out of the blue still...the embarrassing type)

the only thing i can think started the flare up is i put on a bit of weight, could that be it? although i know my asthma is genetic...