Hello:

Have a question re DEET.

Have a friend who is lactose intolerant, and as a result apparently emits a
higher
level of CO2 than most folks while exhaling.

Mosquitos just love him in the summer.
If you go out with him, they all go to him.  Really amazing.

Anyway, want him to try some of the stronger DEET products than he has been
using presently.

A bit worried about the 100% deet, as I read in several places over the
years that
at this strength it is a carcinogen and should be avoided.
True ?

Dropping down in strengths, I see iall the products seem to go from the 100%
to 30% for several 3M offerings.
Doesn't seem to be anything between 100% and 30%, surprisingly.

Is the 30 % "fairly" effective ?

How dangerous is this stuff per any recent research ?

Any other repellents "worth" trying ?

Thanks,
Bob