It really depends on where you live and the repression. In France, drug dealers paint large ads on buildings, advertising coke and weed, flood telegram channels and so on. If alcohol and cigarettes sellers do it on a massive scale, why wouldn't other drug dealers do the same (if the conditions allow it).
Drug users can be found at every stage of the society, either because of psychological/genetic issues making them more prone to consume, or because it's a cultural thing to do it (e.g alcohol), or there is peer pressure leading to consumption. Your living conditions have little to do about it, really.
Drug users can be found at every stage of the society, either because of psychological/genetic issues making them more prone to consume, or because it's a cultural thing to do it (e.g alcohol), or there is peer pressure leading to consumption. Your living conditions have little to do about it, really.