Yes. this is an old issue. Many of us are aware about these household things which endanger the lives of the inhabitants with several diseases. Especially children are more prone to these diseases.

 I use Neem leaves for repelling the mosquitoes. A small branch of neem leaves hung at the entrances of hall and bedroom.

A small piece of camphor kept in a container consisting of either coconut oil or olive oil will drive away the mosquitoes. Similarly there are a plethora of commonly available things which are natural can be used for natural deodorants.

Some chemicals are unavoidable for preservation of products. So, it is best not to used packaged food and beveraqes. If they used only 'permitted ppreservatives'  within 'permissible limit', nothing  can be done.  

Any preservative used in the Packaged food is laden with chemicals and hazardous to life. So are the other additives like colorants and artificial flavor additions. All are laden with chemicals.

With poisons and dangerous chemicals everywhere, in the air, water, and foods we are consciously taking a risk with our life. Life has become faster and we are interested in short cuts and inviting all dangers. We have to develop an organic culture without which the journey ahead will be difficult. 

True. Organic food is the only way out to counter this menace. Or, let's cultivate the habit of using household  materials like Neem, camphor etc

We all aware about these. But we unfortunately or unconsciously practised it and we are follow it regularly. Why can't we change this attitude? All Allopathy medicines which have adverse effects and we all knew it. We can do first-aids with natural ingredients. 

True. With natural ingredients, we can save ourselves and the family from several diseases and avoid the pesticides and beauty products which are ridden with chemicals.

http://eartheasy.com/grow_nat_pest_cntrl.htm

Anything that causes constant irritation to any part of our body both external and internal can become cancerous...So, as far as possible it is good to go back to basics..Use organic fertilizer and use less chemical based products and go in for natures products 

Almost all the mosquito repellants, shampoos hand sanitizers are laden with hazardous chemicals. Some of these chemical laden things we can use Neem leaves for repelling the Mosquitoes and Camphor mixed with coconut oil can be used as Deodorant.

But these pesticides and insecticides are essential for us. Definitely it depends how we use them. Not only these chemicals but there are other things also which may cause cancer. We are always on the risk of getting diseased.