^Yea, this has always been my experience in life; the life of a "heavy-weight" as they say. I've always required more of almost every drug, except like, Amphetamines and Cocaine, stimulants in general I guess, but everything from Alcohol to Opiates to Benzodiazepines I would require more than my peers and I mean people of my size and my age. It's definitely not just subjective either, others around me are usually in agreement.
I'm not saying we're the same, but you can use my experience as a reference point to know just how different people's reactions to drugs can be. I don't get any effect from Tramadol and have never been able to take larger doses due to the drug's convulsant activity. If I take Codeine, it's cause I have no access to any other Opioids and I'm not in the US where I can get it easily and cheaply. I'll do a CWE and end up with ~2.5g of Codeine and whatever else. This will make me feel "normal" for about 24 hours. This is after my tolerance has basically reset; a week or so into abstinence.
Some people get utterly rocked by 2mg of Alprazolam for instance, but name any Benzodiazepine. I'll generally take 3mg -4mg to get the full effect that I'm looking for. I'm still functional on this dose, meaning I haven't yet crossed the line into total disinhibitioin and amnesia, but this is really too much for most people to be taking if they wish to be safe, secure and not in trouble.
Alcohol, granted, I've never drank a half-gallon of Vodka a day like you hear from some people, but I've drank my fair share of liquor and I'm definitely what people would refer to as an alcoholic so it's hard to tell at this point how much Alcohol I require for my desired buzz, because at this point I always drink to comple blackout. Hence, I don't drink at all anymore and things are a lot better.
But I digress, there are some people who just have innately higher tolerances for certain drugs. You and I aren't the only ones. It's actually a pretty shitty "condition" to have as you have to spend more money and people will judge you for being out of control just because you take more than they do.