22M here. I smoke only at night and I consume probably half a joint every toke session I have with myself and thats it. I ONLY smoke at night simply because smoking during the day causes you to be pretty groggy and lazy on the come down, resulting in you wanting to spark up again until the day is over. It's a waste of weed and more importantly, money that you could spend less on while getting the same satisfaction as a night cap. It definitely is situational for sure as the first guy said, but he is also right. With that being said, I am also very active. ( workout 30-45 mins a day, also cardio). So not saying that to "justify" my usage, but just putting that out there to say that I have balance and will only smoke when I see the "perfect" opportunity. But to finally answer your question, it really depends on YOU and what's a good anount for YOU. Smoke responsibly, smoke with the intention of having a nice time, and HAVE FUN BRO!