you should also know that just yesterday I saw interesting things concerning smoking grass: he will be at 20% more of a risk of developing cancer of the lungs/bronchioles/throat than a regular smoker.
That is a huge %! The reason why, is that the paper used to roll the joint is very high in noxious substances. The smoker also holds the smoke in for a long while...that creates a lot of damage, so I would urge him to stop for general health reasons.
There are also studies on the stupefying effect on regular grass smokers...it can kill off brain cells. If you are thinking of having a child with him in the future, then you want him to be around to help you bring it up, right? Good luck!
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Twenty years from now you will be more disappointed by the things you didn't do
than by the ones you did do. So throw off the bowlines. Sail away from the safe
harbor. Catch the trade winds in your sails. Explore. Dream. Discover.
- Mark Twain
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"I am not young enough to know everything."
- Oscar Wilde (1854-1900)
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