[voodoomagicman]

It IS addictive. It can't cause withdrawal symptoms, but absolutely is addictive, like gambling or sex or any other activity that triggers your reward system. I know I felt addicted to pot, failed to quit smoking many times after making the decision to, and kept smoking daily for a year after I had stopped enjoying it. If not addiction, what would you call that?

If you can be sure that someone is reliable, then you are right, there is no reason to have a problem with their drug use. When you are hiring someone or making the decision to invest money with them, you rarely know enough to be sure. Using drugs is a HUGE red flag there, and should say think twice before hiring this person / giving them money.