It will be difficult to answer this question until people know the ages of your brother and you, FYI.

I am in my late twenties and he is in his early teens. He has already asked me to smoke him up and I said no, not yet. So how long should I wait? Or if it's not about time/age, what should I wait for?

Can y'all tell me your opinion in words, not just ratings, so that I can understand your reasons and such? Thank you.

My first thought is to say don't ever do it. Having said that, I would say wait until he is 21 and able to make rational decisions on his own. Don't forget that he may be emulating you, thinking that whatever you do is "cool" and that you can do no wrong. That is what I thought about my older brother. I suggest 21 because at that age he should be more or less done growing physically, and any negative effect from drug use will not affect his development. Also, being 21 allows him to be more mature and have more experience to draw on before making decisions.

It's a judgment call. My sister got me high when I was 13. I was already smoking it and she thought "what the hell". Nothing came of it, it didn't change my view of her in anyway. It's up to you, Do you want to smoke your brother a joint? once you start sharing you'll never be able to stop.

By the way, the update on this is that the last time I saw him, when my brother was 16, my step-mother (his blood mother) ASKED me to smoke him. As it happens I was unable to at the time and haven't seen him since.

Here are 6 different sources, the first 6 I found (meaning I didn't skip over any that would work against me -- not to say they aren't out there). As you will see, none of them suggest any effects on teenage development due to mild, recreational marijuana use. Some suggest developmental effects due to heavy use (but I don't promote heavy use for anyone, especially not for someone in school like my brother, because of the short-term effects to say the least), but even these sources say more research is required before anything can be proven. According to NIDA (http://www.drugabuse.gov/MarijBroch/MarijIntro.html): - short-term effects (that is, those experienced while under the influence) are: degraded abilities in short-term memory, judgment, and perception, which can have significant impact on learning, decision-making, and the operation of machines and performance of tasks - heavy and prolonged use leads to all of the above as long-term effects (that is, experienced even while not under the influence), as well as damage to the lungs/airways and the immune system, a possible heightened risk of cancer, and a possible hastening of the normal age-related loss of brain cells related to memory - studied on pregnant women have suggested an effect on foetal development Ultimately, there is nothing in this source to indicate that light, recreational use of marijuana could have any effect on teen development. According to "Marijuana's Effects on Human Physiology and the Brain" (http://www.echeat.com/essay.php?t=28967), "a delay in adolescent brain development is common when marijuana usage begins at a young age," however none of the sources cited back up this rather vague statement. Instead, the sources talk about emotional development, by which they describe as related to a normal sense of responsibility, initiative, and sociality. Absolutely no evidence is given which actually pinpoints marijuana as the cause of this delayed development, and frankly I think it's highly likely that the real cause is social factors often found in connection with marijuana use. Basically all the evidence is circumstantial, none of it is direct, and none of it suggests that marijuana use could have any developmental effect on a relatively happy, healthy, well-adjusted teen who has a good family and good friends who take casual marijuana use in stride. This source also mentions the same effects as mentioned by NIDA, as well as: - short-term effects on heart rate and blood pressure which can prompt a severe reaction (heart attack, heart arrest, stroke) in those who have heart disease - effects on the reproductive system due to disruption of hormone production (short-term effect? long-term? due to mild use? heavy use? the paper doesn't specify, nor does it cite any source for this information): specifically sperm cell abnormality, low sperm count and movement, low sex drive -- to accept this as true I'd need another source and more details, and as it is we can't say what effect this has on development According to Marijuana Addiction Treatment (http://www.marijuanaaddictiontreatment.org/effects.html): - no new information given, no reference at all to any potential effects on teenage development According to "Marijuana Use Takes Toll On Adolescent Brain Function, Research Finds" (http://www.sciencedaily.com/releases/2008/10/081014111156.htm), "chronic, heavy marijuana use during adolescence [...] is associated with poorer performance on thinking tasks [....] that’s evident even after a month of stopping marijuana use [...]. [W]hile recent findings suggest partial recovery of verbal memory functioning within the first three weeks of [...] abstinence [...] complex attention skills continue to be affected." This source provides no information regarding light, recreational use, nor the consequences of abstinence beyond one month (i.e. is it permanent? Is it really about development, and not just function? This source can't say). According to LiveScience (http://www.livescience.com/health/090203-marijuana-brain.html), heavy use in adolescence may cause permanent, developmental damage to areas of the brain involved in memory, attention, decision-making, language, and executive functioning, although "[t]he findings are considered preliminary" and "more research is needed to confirm the work." This sources says nothing about mild, recreation use -- the subjects of the study mentioned "all had a history of heavy cannabis use during adolescence. On average, they had smoked marijuana from age 13 till age 18 or 19, and reported smoking nearly 6 marijuana joints daily in the final year before they stopped using the drug."

According to NIDA ( http://www.drugabuse.gov/MarijBroch/MarijIntro.html): - short-term effects (that is, those experienced while under the influence) are: degraded abilities in short-term memory, judgment, and perception, which can have significant impact on learning, decision-making, and the operation of machines and performance of tasks - heavy and prolonged use leads to all of the above as long-term effects (that is, experienced even while not under the influence), as well as damage to the lungs/airways and the immune system, a possible heightened risk of cancer, and a possible hastening of the normal age-related loss of brain cells related to memory what the hell? smoking weed does not increase your risk for developing cancer, nor does it hasten age related loss of brain cells I smoke weed everyday before and after school, and I am an A/B student.