There's no question that when an otherwise right thinking, law abiding, properly behaving adult makes a definitive decision to include certain items which are not necessary for human existence as food and water are into their life style, then one has to examine such decisions.
One has to examine such decisions based on one's tendency to get involved with interests. An interest doesn't have to be something you put into your body, it could be an interest in trains, coins, stamps, any hobby or professional pursuit whatsoever. When the inclusion of such interests in one's life becomes habitual, behavior altering in a negative sense, and detrimental to one's well being and the atmosphere they create around themselves, then it has gone too far. Such interests do not have to be abandoned, but examined to see if they can be controlled as pleasurable pursuits, or if they are professional interests, how not to have these pursuits affect one's life negatively.
Obsession with hobbies or professional pursuits can damage one's life in many ways, and also one's health. You need not ever have smoked or drank anything to have health problems. Nonetheless, the inclusion of "substances" by an otherwise right thinking adult in a life style must not mean obsession. If the "substance," interest or pursuit can be included in the life style and kept to a level where interest, affects such as flavor, etc. is always high and negative affects are minimal or non-existent, then so much the better. The person's life is well balanced and need not change.
For those of you Bible readers like me, remember that Jesus did not abstain from certain things himself, and recommended MODERATION rather than abstinence. He said that He came so that we might have life and have it more abundantly. Therefore, handle yourself in a responsible and righteous fashion, and there are certain pleasures in life you may grant yourself when the time is right.
Such as, a fhine, fhine, ptttttttttttttemium cigahhhhhhh . . .