Your plant looks healthy. it's probably just heat stress. The high humidity is likely making it tough for your leaves to respire. You mix a good amount of perlite into your soil when you transplant.

What kind of nutrients are you using? be careful that you dont overfeed if youre using generic plant food. never use more than a 50% strength solution unless the nutes are specifically for cannabis.
Faddenator Reviewed by Faddenator on . beginner here is the deal a frind of mine came to me house and threw some seeds in my moms pots and 2 months later i found the baby i want to know how its doing my concern is that the bottom leaves are yellowing and dying plz help thanks Your Equipment: .1) Type and wattage of lights. sunlight .2) Distance from tops? sunlight .3) Reflector type? (cool tube set-up, bat wing, enclosed reflector, bare bulb...) sunlight .4) Is there a consistent fresh air supply? yes .5) Do you have an exhaust fan Rating: 5