argus used arcane magic in almost every part of their lives for thousands of years.
the highbourne used arcane magic for thousands of years with no major problems
dalaran has been around for hundreds if not thousands of years and has had no major problems.
quel'thalas has used arcane magic for thousands of years with no major problems
pandaria has used arcane magic for thousands of years with no major problems.
fel magic is not the same as arcane magic, that is not cannon. its a different form of magic.
arcane magic uses the will of its caster to bend reality
fel magic takes life and converts it to energy, using it drains life from its user and the life around it. blizzard considers it a completely different school of magic.
being addicted to something doesnt make it corrupting. you can become addicted to any form of magic, the high elves didnt become addicted to the arcane because they were using the arcane, they became addicted because the sunwell was literally pumping their bodies with magic 24/7 since their birth and it got taken away.
pain killers on their own are not corrupting. if you get pumped with pain killers 24/7 and then one say someone just shuts them off you will go through withdrawals. not because pain killers are corrupting, but because your body grew dependent on something.
if somebody pumped their body with holy magic or druidic magic or elemental magic the same thing would happen