While not cheap, headphones with active noise cancelling is much better for public transport imo. E.g. the Sony WH-1000XM4 would set you back $350, which is a bit, but probably much cheaper than a car

Posted this comment elsewhere, but is relevant here so I'll repost:

Further research is needed, but when digested casein breaks down into casomorphin which might bind to opioid receptors and release dopamine.

Sources:

• https://en.wikipedia.org/wiki/Casomorphin
• https://efsa.onlinelibrary.wiley.com/doi/10.2903/j.efsa.2009.231r
• https://www.healthline.com/nutrition/is-cheese-addictive#your-brain-on-cheese

Further research is needed, but when digested casein breaks down into casomorphin which might bind to opioid receptors and release dopamine.

Sources:

• https://en.wikipedia.org/wiki/Casomorphin
• https://efsa.onlinelibrary.wiley.com/doi/10.2903/j.efsa.2009.231r
• https://www.healthline.com/nutrition/is-cheese-addictive#your-brain-on-cheese