I've been curious about why some acts humans participate in are considered sins from a religious standpoint and thought some of the religious experts here can help with some logical explanations - not necessarily from having to quote verses from books.

Why is it a sin to inhale smoke from cigarrettes or marijuana and its not a sin to inhale ordinary air? Aren't same substances created for humans by same God? Why is it a sin to drink alcohol and its not a sin to drink water or soft drinks? Aren't the contents created by the same Creator?
Hard-drugs that some folks indulge in have been broken down to the respective components they are made up of, and my understanding is that all matter is created by God. Why then are those that choose to consume these drugs considered sinners?

Cooking certain ingredients with meat, fish, pepper,salt, spices etc spark up reactions that leads to a soup that we all love to eat. That is not a sin (even though some animals may have been killed in the process of cooking the food), yet cooking certain ingredients to make whatever those that want the drug effect of whatever they cooked (no animals killed) is considered a sin. Why? Isnt everything cooked created by same God?

Some things don't add up here in my opinion. Unless we have to say one God created certain items and another God created the others.

Isn't it just okay to say some actions are just immoral versus terming them sins?
Does it make sense to say some people that consume certain items will end up in hell and those that don't consume them can make it to heaven as long as they add X,Y,Z more to whatever they do or don't do? When all items on earth are supposedly created by same God?

Opinions from those more learned in this area will be appreciated. No need to quote books, logical explanations are preferred.