The laws are unnecessary, and the effect of these laws are the direct cause of the very deaths you talk about. The deaths are not a necessary result of drug consumption, but of the laws.
Laws cannot change people's preferences and every time society's laws attempt to ignore the more fundamental laws of supply and demand we end up with bad outcomes. Either people starving or the creation of powerful drug cartels and all the other problems.
The drug market exceeds the IT market, and is second only to the war and oil markets. Pablo Escobar was once the wealthiest man on the planet. My personal consumption is no major concern in the overall scheme.
All drugs should be fully legalised. Regulated for purity, for correct labeling, where, when and to whom they can be sold, and taxed according to their intrinsic negative externalities. Just like every other commodity in existence, because the further you drift from a free market the more the social utility loss, which is another way to say unnecessary suffering and death.