I think the jhanas are more wholesome than recreational drugs so I would recommend people who like to use drugs to try jhanas.

Too much bliss shows one that happiness is not all it's cracked up to be. Sukkha (tranquil happiness) is nicer than Piti (intense rapture).  When you can have as much happiness as you want, you stop craving it. It's the law of supply and demand, if there is an overabundance of something, its perceived value goes down.

You can learn to control the intensity and bring a nice level of sukkha into daily life much of the time. I think a lot of socialization that children undergo as they mature causes us to suppress happiness to the point were we forget how to be happy. Practicing the jhanas helps us remember how to be happy.

The Jhanas give you lessons in letting go of attachment to pleasant feelings. In fact, attachment to pleasant feelings is an obstacle to experiencing the jhanas, letting go of that attachment makes it easier to produce the jhanas.

The jhanas show you that emotions are flexible. Emotions are not truth, they are not reality, they are not an inevitable consequence of "situations". Situations are not the problem, the problem is how we react to the situation. This doesn't mean we ignore the situation it means we can respond to situations through compassion and reason rather than out of control emotions.

The jhanas provide a pleasant counterbalance to the unpleasant emotions that my arise from vipassana.

The jhanas point out the possibility that there could be an even better way of experiencing reality, one without any illusions, pleasant or unpleasant, and they encourage one to seek this clear liberated mind. It's nicer than pleasure.

https://ncu9nc.blogspot.com/2020/10/a-quick-guide-to-producing-bliss-with.html

"I thought: 'I recall once, when my father the Sakyan was working, and I was sitting in the cool shade of a rose-apple tree, then — quite secluded from sensuality, secluded from unskillful mental qualities — I entered & remained in the first jhana: rapture & pleasure born from seclusion, accompanied by directed thought & evaluation. Could that be the path to Awakening?' Then following on that memory came the realization: 'That is the path to Awakening.' I thought: 'So why am I afraid of that pleasure that has nothing to do with sensuality, nothing to do with unskillful mental qualities?' I thought: 'I am no longer afraid of that pleasure that has nothing to do with sensuality, nothing to do with unskillful mental qualities,...

... quite secluded from sensuality, secluded from unskillful mental qualities, I entered & remained in the first jhana: rapture & pleasure born from seclusion, accompanied by directed thought & evaluation. But the pleasant feeling that arose in this way did not invade my mind or remain. With the stilling of directed thoughts & evaluations, I entered & remained in the second jhana: rapture & pleasure born of concentration, unification of awareness free from directed thought & evaluation — internal assurance. But the pleasant feeling that arose in this way did not invade my mind or remain. With the fading of rapture I remained equanimous, mindful, & alert, and sensed pleasure with the body. I entered & remained in the third jhana, of which the noble ones declare, 'Equanimous & mindful, he has a pleasant abiding.' But the pleasant feeling that arose in this way did not invade my mind or remain. With the abandoning of pleasure & pain — as with the earlier disappearance of elation & distress — I entered & remained in the fourth jhana: purity of equanimity & mindfulness, neither pleasure nor pain. But the pleasant feeling that arose in this way did not invade my mind or remain.