Why should helium be avoided?

Could you please elaborate on the reasons why helium should be avoided? I'm particularly interested in understanding the potential environmental impacts and safety concerns associated with its use. Could you also discuss any alternative options that might be more sustainable or safer to utilize? Additionally, I'm curious about the current state of helium supply and demand, and whether its scarcity might be a factor in its avoidance. Thank you for shedding some light on this topic.