cote - you really shouldn't assume.
i have a lot of experience of addiction, specifically heroin addiction (ex-partner - heroin, speed, lsd, pretty much anything he could get into him). i also have a degree in addiction studies.
when you talk of 'recreational drugs' i think you mean the way in which drugs are used. drug USE may be recreational, yes even heroin may be used recreationally rather than dependently. i have already posted that there is a big difference between experimental, recreational and dependent drug use. i have also posted about the other factors that need to be considered when talking about drug related harm - who is using the drug, what else is being used, state of mind, amount, purity/impurity etc. all of these things affect the drug using experience.
you seem to eqaute heroin being addictive with heroin being harmful. not true - the addiction itself does not harm the addict. people can be maintained on medical heroin for years, what is harmful is the impurity of street heroin, poor injecting techniques, damage to the lungs from smoking heroin, the lifestyle people lead due to the criminality of heroin and getting money for the drug etc etc.
with any street drug you don't know what you are buying, there is no quality control - they are impure, the effects will vary depending on factors such as what else is being used, frame of mind......and the rest as i have posted already.
and you were being patronising again.