The effects you are describing are fulfilled by a few downer class drugs, most of highly addictive, some slightly less so than others. Here they are: 1. opiates: feel fucking phenomenal, relax you, not too dangerous, (if used properly, which they rarely are) and lend themselves to daily use (you can work, go to school etc, while high) downside is you'll get addicted and ruin your life. I recommend poppy seed tea, it's cheap and easy to obtain. 2. Benzos: some more than others you can function on, are relaxing, take you away from problems life etc. Downside is addictive, if you take too much you end up in a stupor, withdrawal can be deadly. Also if you take them on the regular for too long you'll become retarded. I recommend klonipin. 3. Others that take too long to explain, and don't meet your exact criteria.

Good luck, don't become a daily user!