Prano said:as much as you would with cycling
Any of the aerobic sports are conducive to doping. Track and field, marathons, triathlons, biathlons... wasn't there a big doping flap with the Austrian biathlon team at the last Winter Olympics?
US football and baseball are more focused on body mass than endurance, so the growth dope is popular - HGH, steroids. Same goes for bodybuilding. WC football is definitely an endurance sport, so out with the EPO and blood transfusions. (and there were footballers involved in Puerto, but it was hushed up) Same with tennis - blood boosting insures the athlete will still be performing in the third set.
Cycling isn't the only sport that has a doping problem, probably isn't even the dirtiest. It's just the one getting all the publicity right now. It draws more money that most of the aerobic sports so the reward for doping is higher, and isn't as well organized or financed as the more popular sports, so covering up the doping hasn't been done very well.
In any business where athletic performance is tied to financial reward, there will be doping.