Personally I don't consider doping as cheating. Doping is fact in top level pro sport. Cycling, athletics, soccer, tennis, xc skiing... it's all same. So when everyone are using it, it's kinda hard to say it's cheating. Sure it might look like cheating to someone watching all this from outside, but then again, does having equipment you can't buy as recreational athlete means cheating? And if we like it or not, doping is quite same as lighter bike wheels... part of whole process. I have been into this (although it wasn't cycling, but it was one of sports I mentioned before ;)) that I know how it goes on World cup circuit, when it comes to this things, and I lost illusions of clean sport. It's not clean even on recreational races, where they fight only for medals, and it's even less clean on top level, where next to medals or trophies, they also fight for millions of sponsor money.
I'm far from Lance fan. Personally I don't even like him, but for me he won all 7 Tours fair and square (ok his WCH title was lucky one), even if they will prove now that he was using doping. He still beat everyone else fair and square. And I still consider that stage which Landis won, and after which he got caught, as one of greatest rides in history of cycling. So what, he got caught, but with a bit of luck, he wouldn't. If we look at most of riders they caught in last few years. Everyone were admitting use of doping through the years. They all had 100s of doping tests and they always tested negative. So not testing positive doesn't mean you are clean, it just means they didn't caught you ;)
As far as "healthy doping" goes... Sure using some food supplements might be healthy. Using epo, using cow and pig blood plasma, using your parents or your brothers blood (they don't test your relatives), using cancer medicine, when you have no cancer, using medicine which is in test stages or even before real test stages and noone knows what that medicine even is, is not really healthy thing ;) Sure EPO can't kill you directly, but when your blood is so "thick", you need to sleep with HRM to wake you up if your pulse drops down, is not really normal procedure, don't you think? ;) So I wouldn't really consider doping in top pro sport as healthy thing ;)