No, I don't suppose it does, but then taking drugs in cycling is technically illegal. Regarding your second point, I reckon the proportion of footballers who have read the research into dementia and heading is practically zero.
I see parallels with rugby, which has obvious issues with concussion and brain injuries. While it remains to be seen if the measures they've introduced have made a difference, they have at least tried to address it rather than brush it under the carpet and say "head shots are just part of the game, get on with it."