For hot or cold you can make sure to replenish electrolytes. Make sure you are dressing appropriately in cold weather (dressing warm enough but not too warm because of overheating). If you are exercising in hot weather make sure to be hydrated when you start, drink water throughout, and pay attention to your body and if you are overheating make sure you stop and take a rest or slow down.
For one teens get addicted mostly through peer-pressure and two the brain becomes confused with whats wrong and whats right once you start and can't quit.
The answer to your answer is B because who cares what your freinds think,from a personal experience I shouldn't but I do,but still I shouldn't and neither should you or anyone else for that matter.
