I consume THC primarily through edibles so I am often the guy people come to for their first time getting high. I give new users 5mg and I tell them to wait for an hour. For first timers it can take a little longer for them to notice. Sometimes I will make sure they get up and do some jumping jacks or something to get that blood moving.

If after one hour a new user is not reporting feeling any different from 5mg I will give them 5mg more and tell them not to take another gummy for at least 5 hours. I would say 95% of the time that second 5mg they do start to feel it properly.

I should note that everyone is different and some people will not ever feel 5mg and some people (like my father) take 2.5mg because that's all he needs. After doing this for years with a lot of people I feel confident in saying that 5mg and an hour wait should work on 75% of people.

My little sister who weighs next to nothing compared to me barely notices 10mg so your milage may vary. It's a bit like alcohol. Some people get drunk off one glass of wine. Some people need a whole bottle to feel anything. Always take it slow your first time and it's ok if you don't feel anything the first time. There is almost nothing worse than going way too far on your first time with THC. My brother did that for me and I was coughing and throwing up for like 20 minutes before I basically passed out in the backyard.