Balance adjustment was made.
The basic policy remains the same: don't get bored when reading skill books.

However, the effect was made smaller because the amount of unhappiness and stress reduction was too great.
Also, when the character is in poor physical condition, the effect is even smaller.
It was unnatural for them to be easily recovered even when infected by a zombie bite and full of wounds and on the verge of death.

The effect occurs per page read and is almost constant in in-game time regardless of the traits of fast or slow reader.

• Fixed: If the PC is a smoker, the stress value is calculated incorrectly.
  But that doesn't change the fact that reading doesn't relieve the stress caused by smoke deficiency.

• Fixed logic based on day length and traits.
  
• Tweaked the balance a little.

• Stress reduction balance adjustment.