Moderate euphoria

Imagine two new drugs have recently been released to the market. Drug X has a low therapeutic index, is taken orally, is available by prescription only, and needs to be taken twice a day. Drug Y is dispensed as an inhaler, does not require a prescription, has a high therapeutic index, and produces moderate euphoria. Based on this information, which of these two new drugs is more likely to be misused? Provide four reasons to support your choice.